What if they never call you back and, shamefaced, you realize you were simply their booty call for the evening? Speaking of which, are you mentally prepared for the eventuality when your ex tells you they have moved on to their next partner?
If you are all right with all of this then go ahead have tons of protected sex with your ex. If not, take a long cold shower or slap on a chastity belt when you feel your resolve wearing thin. Do whatever it takes to stop you from calling them.
One great thing that comes out of having sex with an ex is the valuable lesson learned. Ultimately satisfying an urge at the sacrifice of self worth is never worth it—yes, even if the sex is amazing.
Samantha Jones, the infamous character from “Sex and the City,” put it best: “Sex with an ex can be depressing. If it's good you can't get it anymore, if it's bad you just had sex with an ex.”