If I want to have sex with a Swedish woman while on vacation there,?
Contracts and lawyers would get you security, but they wouldnt get you laid. I think the only reasonable thing to do is to make sure that whoever you liaise with is genuine and sane. Not drunk, not a goldbricker, not likely to go mental on you and forget that you originally liked each other the list goes on. Essentially, it boils down to dont sleep with people you dont fully trust. Now that shouldnt be such a novel concept.