I can confirm they don't have to go to classes, but they do still try to sneak off. You have to watch them like a hawk and cancel it or the sneaky lil buggers will head out anyway.

But you have to watch them like a hawk anyway because they are always trying to sneak out of their coffin, sneak out of the house, sneak to class. Almost enough to make me play them free will off as they have no sense at all. You think a fear of the sun could have been coded in at least.

I didn't have a problem with him wanting to go outside though. Everything is inside, except for some garden plot, and a basketball thing. Nothing very interesting.
When i first created him, as an adult, to test the vamp mods I had, I moved him on a lot that had a pool outside. Since pools are very attractive..he wanted to be in it.
But this is not a problem I have now, on the dorm I built, since outside stuff is rather boring, compared to the interesting stuff found inside.
I'll still have to move him into another dorm I built though, that has no green house walls/roof part!