Freshman year of college my roommate (didn't much like him) started letting his girlfriend sleep in his bed with him (we shared a room) even though she lived down the hall. I didn't really care except that she whistled a lot. One night she started going down on him while I was in the room trying to sleep. This annoyed me so a few nights later I went out and brought a girl back to the room when the two of them were sleeping in there and just started fucking her. The roommate's girlfriend was annoyed and ran out screaming. The roommate just watched. A few days later he suggested that we try and both have sex with the girls in the same room, but his girl wouldn't go for it.
At a house party I met this girl and we went to a bedroom and she blew me. There was a balcony/porch off of this bedroom where people were allowed to smoke. Three girls watched us a good four or five cigs...
At one point I was regularly fucking this hot Asian girl and my friends all sorta didn't believe me when I told them about it. She sort of hung with a different crowd and none of my friends knew any of hers. At a party one weekend my friends and I ran into her. I made a point of PDAing, then took her into a bedroom and started fucking her. My friend Dave 'accidentally' dropped into the room and saw us, then went back to the party and shouted, "Holy fuck, Cdog* is fucking that Asian chick- you gotta see this." Three of the crew decided to come take a peek.
There were a few other instances when I "did it" in public but I don't know that anyone was watching. These include the beach, a waterfall, a back room at a convention center, a coatroom at a banquet hall (cheesy and cliched, no?), and the back room/ loading dock at a Target. And of course in my car parked various semiprivate places.
*He actually used my real last name which I won't be posting here.
