Personally, I don't, although I have only done that once (or twice ) in the past and found that it was too complicated. But do you sleep with your exes?
I totally do it. With the exception of one. Her constitution is 0; she's dead to me. Asides that, i still sleep with several of my ex's with no compunctions.
I'm getting offered free sex. Free. And sex is fantastic. Naked bodies? Sweat? Oh you bet your ass i'm game. If i get any sort of contact from them for any reason; i set a date and make it happen. I'm not going to say no to a night of passion. I don't have the luxury of time on this planet - i could wake up dead tomorrow for all i know. Might as well go with a bang.