not exactly sex, but in the back seat of a car while my friend drove, his girlfriend in the front passenger seat, her 2 friends in back with me, one sucking me off, me making out with the other, them swapping, closest ive come to a threesome!
on a sandbar 50 ft out in the ocean on a crowded beach.
in the woods hiking with a group, we slowed down and had a quickie off the trail hoping no one would turn back looking for us