Sexually, one of my favourite reads on Tony is that he thinks he's a big toppy alpha male, but he's intrigued by the possibility of Tim taking a bit of that control away from him for awhile. ;D

As for whether he identifies as gay or straight, I honestly don't think he's ever sat down and put a name to things. Labels have worked for him for most of his life so he's not about to reject them as too confining so he doesn't bother fiddling with them.