I would guess that it might be remotely possible, but so extremely unlikely you shouldn't worry about it. Sperm doesn't live long outside the body, so if the guy who ejaculated used the towel a few hours earlier, I'd say the odds are prbly well over a million to one that it could happen. Relax - I'm sure you're fine. Auntiejessi, you've worked in this area & w/ STDs, care to comment? I'm guessing you'd agree that it's very unlikely...