@Tearsax
Not that I'm defending him, but all of this is her and the family's fault. He very clearly hadn't been given
any sort of sexual education by his family until he was 20 years old, and the first thing he's taught is that in order to masturbate, you do it by rubbing yourself on a woman. Masturbation is something that becomes an addiction if you do it every day, and nobody has ever taught him the proper way to masturbate. This way is
literally all he knows, since nobody has ever told him otherwise. Even when he's told to "do it by yourself", he just assumes that means "rub on them without their help".
Add in his sister who taught him "it's okay to have sex with someone you like", coupled with the fact that nobody has taught him restraint (let alone proper sexual education), then of course he's going to turn out this way. He doesn't know he's doing something wrong, but he
is starting to get confused about why his family is starting to act differently. Instead of actually sitting him down and talking to him, they all just give up and go along with it. Even when his sister told him they couldn't have sex anymore, she never explained the reason why, leaving him sad and confused instead of educated. The entire situation is messed up.
Edit: Obviously his attitude could change later and he could become a knowing scumbag. I just meant that as he is right at this point, that's the impression I'm getting of him