dislike sex
It's not that they hate you it's that they just dislike you. Therefor sex being the only solution just to spite them.
Him: Would you say you hate or dislike me at all?
Her: I don't hate you but I don't like you so I'll say dislike.
Her: Why?
Him: Then we can have dislike sex, how about that after saying that if you now think you hate me then we can have hate sex.
Her: I don't hate you but I don't like you so I'll say dislike.
Her: Why?
Him: Then we can have dislike sex, how about that after saying that if you now think you hate me then we can have hate sex.