Unless he was raped up the ass with a dildo, there is no way a man can be raped by a woman.
in the UK that's sexual assault.
Rape has to involve a penis against their will.
The offence is created by section 1 of the Sexual Offences Act 2003:
“ 1-(1) A person (A) commits an offence if— (a) he intentionally penetrates the vagina, anus or mouth of another person (B) with his penis,(b) B does not consent to the penetration, and(c) 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 is liable, on conviction on indictment, to imprisonment for life.