Lol. I'm interested in the person, not his history. How he treats me in the world, at home, and in bed determine whether I'll date him or not. Judging someone on what they've done before is kinda silly, IMO unless you get a LOT of feedback from a peer group that says "watch out for this shady person".
That said, if I'm deciding to date someone, I disclose, they tell me they've been with a TS before and we're just meeting for the first time, I'm going to take a few precautions but that's just being 'not dumb as a box of rocks.'