Causing a person to engage in sexual activity without consent
The offence of causing a person to engage in sexual activity without consent under s.4 Sexual Offences Act 2003 — the statutory elements (points to prove) reproduced verbatim, the penetration/non-penetration split in mode of trial and maximum sentence, and the arrest power, for frontline officers.
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What are the points to prove for causing a person to engage in sexual activity without consent under s.4 Sexual Offences Act 2003?
s.4(1) requires: (1) A intentionally causes B to engage in an activity, (2) the activity is sexual (s.78), (3) B does not consent (s.74), and (4) A does not reasonably believe that B consents, reproduced verbatim below.
Where the activity caused involved penetration (s.4(4)) the offence is indictable only, maximum life imprisonment. Otherwise (s.4(5)) it is triable either way, maximum 10 years' imprisonment on indictment or 6 months' imprisonment summarily.
Causing a person to engage in sexual activity without consent is defined by s.4(1) Sexual Offences Act 2003: A intentionally causes another person (B) to engage in an activity, the activity is sexual, B does not consent to engaging in it, and A does not reasonably believe that B consents. The offence and consent (s.74) are reproduced verbatim below. It is educational reference, not a charging decision — verify against current law, CPS charging guidance and force policy.
Offence
s.4 Sexual Offences Act 2003
Mode of trial
Triable either way; indictable only where the activity caused involved penetration (s.4(4))
Maximum sentence
Life imprisonment where the activity caused involved penetration of B's anus, vagina or mouth, or penetration by B (s.4(4) Sexual Offences Act 2003). Otherwise, 10 years' imprisonment on conviction on indictment or 6 months' imprisonment on summary conviction (s.4(5) Sexual Offences Act 2003).
Points to prove — statutory elements
Reproduced verbatim from the Act as published on legislation.gov.uk. These are the statutory elements, not a paraphrase — confirm the up-to-date text and any amendments at the source.
(1) A person (A) commits an offence if—
(a) he intentionally causes another person (B) to engage in an activity,
(b) the activity is sexual,
(c) B does not consent to engaging in the activity, and
(d) A does not reasonably believe that B consents.
(2) Whether a belief is reasonable is to be determined having regard to all the circumstances, including any steps A has taken to ascertain whether B consents.
(3) Sections 75 and 76 apply to an offence under this section.
(4) A person guilty of an offence under this section, if the activity caused involved—
(a) penetration of B’s anus or vagina,
(b) penetration of B’s mouth with a person’s penis,
(c) penetration of a person’s anus or vagina with a part of B’s body or by B with anything else, or
(d) penetration of a person’s mouth with B’s penis,
is liable, on conviction on indictment, to imprisonment for life.
(5) Unless subsection (4) applies, a person guilty of an offence under this section is liable—
(a) on summary conviction, to imprisonment for a term not exceeding 6 months or to a fine not exceeding the statutory maximum or both;
(b) on conviction on indictment, to imprisonment for a term not exceeding 10 years.
For the purposes of this Part, a person consents if he agrees by choice, and has the freedom and capacity to make that choice.
For the purposes of this Part (except sections 15A , 66B to 66D and 71 ), penetration, touching or any other activity is sexual if a reasonable person would consider that—
(a) whatever its circumstances or any person’s purpose in relation to it, it is because of its nature sexual, or
(b) because of its nature it may be sexual and because of its circumstances or the purpose of any person in relation to it (or both) it is sexual.
Powers of arrest & search
A constable may arrest without warrant anyone whom they have reasonable grounds to suspect of committing this offence, where an arrest is necessary on one of the s.24(5) grounds (PACE 1984 s.24). There is no separate statutory stop/search power for this offence.
Code of Practice: PACE Code G — arrest →CPS charging guidance
Verbatim extracts from the CPS charging guidance (Crown copyright, reproduced under the Open Government Licence v3.0). CPS revises this guidance — confirm against the live page and current law.
Key points:
The offence can be committed by words alone, for example, defendant makes his victim carry out a sexual act, such as masturbation, that only involves the victim
This offence covers situations where, for example, a complainant is forced
to carry out a sexual act involving their own person, such as masturbation, or
to engage in sexual activity with a third party, who may be willing or not, or
to engage in sexual activity with the offender, for example, woman forces a man to penetrate her
This section creates two separate offences, penetrative and non-penetrative.
The mode of trial and maximum sentence varies depending on whether there is penetration
The non-penetrative offence is either way and attracts a maximum 10 year sentence on indictment
The penetrative offence is indictable only and attracts a maximum sentence of life imprisonment.
Charging practice:
The prosecutor should specify either that the sexual activity is penetrative or non-penetrative when selecting and drafting charges under this section
One of the purposes of this offence, in addition to the wider range of sexual activity, is to create a female equivalent of the offence of rape, which carries the same level of punishment for what amounts to the same type of offending behaviour. Please refer to the chapter on Issues relevant to particular groups of people
If the complainant is under 13 years then the offence should be charged under section 8 Sexual Offences Act 2003. If the complainant is 13 to 15 and there is no consent the offence should be charged under section 4 Sexual offences Act 2003
If the suspect is 18 or over and in a position of trust to the complainant and the complainant is aged 16 or 17 the offence should be charged under section 17 Sexual Offences 2003
In determining seriousness reference should be made to the sentencing guidelines.
The definition of sexual is contained within section 78 of the Sexual Offences Act 2003 and applies to all offences in part 1 of the Act, with the exception of section 71 (sexual activity in a public lavatory).
Penetration, touching or any other activity is sexual if a reasonable person would consider that:
whatever its circumstances or any person’s purpose in relation to it, it is because of its nature sexual, or
because of its nature it may be sexual and because of its circumstances or the purpose of any person in relation to it (or both) it is sexual.
In deciding whether an activity is sexual look first at the nature of the activity. If the activity is by its nature sexual (for example, sexual intercourse, masturbation) then it is sexual for the purposes of the legislation.
Where the nature of the activity may or may not be sexual prosecutors should consider the circumstances or purpose (or both) of the defendant in deciding whether it is sexual.
Where the nature of the act cannot be sexual, it is not made sexual by a person having a secret fetish.
Touching of clothing might be sexual as in the case of R v H [2005] EWCA Crim 732.
- Whether the activity caused involved penetration (s.4(4)) determines BOTH the mode of trial and the maximum sentence — it is not a single either-way offence with one maximum. Check s.4(4) against s.4(5) before classifying the offence.
- The offence captures A causing B to engage in the activity on B's own body, on A, or on a third person — s.4(1) is not limited to activity between A and B.
- Sections 75 and 76 Sexual Offences Act 2003 set out evidential and conclusive presumptions about consent that apply to this offence (and to ss.1-3) in specified circumstances (e.g. violence, deception as to the nature or purpose of the act) — they are not reproduced as points to prove here but are relevant to how consent is proved or presumed.
- A conviction under s.4 triggers the notification requirements ('sex offender registration') under Part 2 Sexual Offences Act 2003, with the notification period set by the Sentencing Act 2020.
Related reading
Primary sources
BlueLineHub is independent and unofficial. Always verify with the authoritative source below.
- Verify on official source
Sexual Offences Act 2003, section 4 — causing a person to engage in sexual activity without consent
The offence, and the penetration/non-penetration split between the indictable-only maximum of life imprisonment (s.4(4)) and the either-way maximum of 10 years on indictment or 6 months summarily (s.4(5)).
Last checked: August 2026 - Verify on official source
Sexual Offences Act 2003, section 74 — 'consent'
The statutory definition of consent applied by s.4(1)(c).
Last checked: August 2026 - Verify on official source
Sexual Offences Act 2003, section 75 — evidential presumptions about consent
Circumstances (e.g. violence, unlawful detention) in which the complainant is presumed not to have consented and the defendant is presumed not to have reasonably believed in consent, unless sufficient evidence is raised to the contrary.
Last checked: August 2026 - Verify on official source
Sexual Offences Act 2003, section 76 — conclusive presumptions about consent
Circumstances (deception as to the nature or purpose of the act, or impersonation of a person known personally to the complainant) in which consent and reasonable belief in consent are conclusively presumed absent.
Last checked: August 2026 - Verify on official source
Sexual Offences Act 2003, section 78 — meaning of 'sexual'
The statutory definition of 'sexual' applied by s.4(1)(b).
Last checked: August 2026 - Verify on official source
Police and Criminal Evidence Act 1984, section 24 — arrest without warrant: constables
The power of arrest without warrant, subject to the necessity criteria in s.24(5).
Last checked: August 2026 - Verify on official source
Sentencing Council — Causing a person to engage in sexual activity without consent guideline
The Sentencing Council guideline used to assess sentence within the statutory maxima set by s.4(4) and s.4(5).
Last checked: August 2026 - Verify on official source
CPS Rape and Sexual Offences prosecution guidance — Chapter 8: Key Legislation and Offences (Open Government Licence v3.0)
CPS charging guidance for Sexual Offences Act 2003 offences — the verbatim extracts shown on this card.
Last checked: October 2026
Frequently asked
- What are the elements of causing a person to engage in sexual activity without consent?
- Under s.4(1): A intentionally causes B to engage in an activity; the activity is sexual (s.78); B does not consent to engaging in it (s.74); and A does not reasonably believe that B consents.
- Is this offence indictable only or triable either way?
- It depends on whether the activity caused involved penetration. Where it did (of B's anus, vagina or mouth, or by B), the offence is indictable only, maximum life imprisonment (s.4(4)). Otherwise it is triable either way, maximum 10 years on indictment or 6 months summarily (s.4(5)).
- What power lets me arrest for this offence?
- PACE 1984 s.24 — arrest without warrant where you have reasonable grounds to suspect the offence and an arrest is necessary on one of the s.24(5) grounds. There is no separate statutory stop/search power for this offence.