My wife and I did the nasty on the balcony of the Contemporary tower overlooking the Magic Kingdom. It was 3:00 in the morning, so we were pretty sure little ones couldn't see us, but the futon that was in the room got a workout when we squeezed it onto the ledge!
Several years later in Epcot, when our son (not conceived at the Contemporary as far as I know) was bing potty trained and said "I GOTTA GO NOW!" we realized that we were around that dead zone between the Imagination area and the lagoon, far from a men's room. Since I knew he'd never make it (and anyone who has trained a kid will know the first month is rough), I had him jump behind a bush and tinkle on the grass!