I would argue that having your body penetrated against your will is an inherently violent act.
Yes, it is. However, the person you're replying to is talking about consensual intercourse where one of the participants is considered legally incompetent. That kind of rape is not violent. It is, however, still immoral and sleazy.
"Oh what wouldn't I give to be spat at in the face..." -- a prisoner in "Life of Brian"