He has dated women though so I always thought he might be bi?
Anyway, more interesting to me (and I don't believe this has ever been brought up) is what happened to Todd's devout Catholicism which was every-so-often brought up in Infinity Inc? He would even pray the rosary to get over his adopted father's abuse. It would be easy to say he dropped being Catholic when he came out because the two are irreconcilable but that shouldn't necessarily be the case (I can think of the GLTB Catholic group, Dignity, off the top of my head) and he does hang out with a very devout open-minded Catholic in Doc Midnite.