The context is sexual and the example, straightforward: providing an alternative to "a man's penis penetrates a woman's vagina" where the female organ is the subject of the sentence, and using a verb in active voice. The verb should not have major connotations of passivity, so "accept" cannot be... accepted.
The friend who came up with this question believes no such verb exist, pointing at stereotypical associations between genders and active/passive roles. I couldn't find a valid alternative, but neither of us is a native speaker.
I'm looking for a verb in common or formal language, so no slang!