The fact that he comes out to Penny at the end of his romance suggests the former, and even before that it's pretty clear that Ian is sexually open enough that he'll admit he's very into using anal toys.
Mistaken for Racist: Happens twice in the beginning of the game.Likes Older Men: Especially in the case of Donovan, who acknowledges and lampshades the age gap between them.Jerkass: If the player so chooses to make him one.Even the Guys Want Him: If Ian and Luke are any indication.