I'd say makoto is pretty much just your ordinary teenager, thinking with his penis. I feel like he's a not-so-subtle message saying: That's probably how you would feat if you were the protagonist of a story- everyone criticizes his actions, but most would do the exact same things.
Easy sex? of course. Random drama? hell no, I'm not guilty of anything, I was just having fun.
Sounds like most people to me, honestly. That's why I like school days- I hear day after day about how nice it would be to have a harem from other otaku and whatnot- Well, here's what happens when you actually try to make one.