Responses
I agree but it also to the affect that he's trying to distract himself but is also angry and he going with his strongest emotions rather than thinking thing through or figuring out what is important. I'm betting he's regret quiet a few things he's doing and are going to do. And too many people are quick to call people sluts. Hell I went out with some out in middle school and was called a slut when nothing happened and now he's hella gay and open about it.
lot's of people calling him a slut and wondering about his motives. It's simple - he's angry. Mostly angry at his brother, angry at Arata for using him as revenge, and possibly some anger issues stemming from being the 2nd son of a wealthy family (and from a mistress too, I think). When people get angry, they don't think straight and make some stupid decisions. It doesn't help that he's only 18 or 19, and that he's now working right smack in the middle of the sex industry.