He doesn't like certain things, well, maybe for now. Who knows he might say yes to 'them' later. Doesn't look like a guy whose 'I am no slut' bumper sticker can be trusted. I think he just wanna play around as a 'good guy' for a little while, maybe he thinks he is still too young to be naughty and stuff. Unlike Ben Petersen; adorable fitness guy and a soon-to-be physical therapist whose 'I am a good person and I believe in everything good' personality is totally believable. I'm not saying Ben is better than anyone else, but to put it simply, would be harder for me to believe Ben wants to be a slut than Levi is a slut.