Someone who's willing to embrace your situation and will therefore be worth it. To be honest, I'm lucky enough to have had my fiance before PTSD. To be honest, I'm still amazed he's stayed and dealing with my ****. I'm not easy to handle. I have episodes that are so difficult to get me out of, I rarely am in the mood for sex and I'm irrationally anxious and angry 90% of the time. I've only been dating him for three years but we've known each other for seven and I think that that counts for a lot. It's usually always a good idea to start off in a friendship or at least take it slow for a while. If a guy can't understand that, then he's not worth it. If he can, then hold onto him. You don't have to get personal right away by saying that you've been raped and suffer from sexual dysfunction because of it. Just tell them that you want to take it religiously slow and if they're willing to deal with that, you're willing to give them a shot. That's the best advice I can really give.
Even when you finally start feeling comfortable with the idea of sex, you should probably discuss the issue of position and triggers prior. Yeah, it'll take away from the romance but in exchange you'll feel in control and safe. That's what should matter.