Places where you’d better not try to have sex:
Leather couches/love seats:
Too uncomfortable. Sitting on 'em naked will make your ass drown in a pool of sweat. Impossible for non-professionals to find a comfortable sex position on them.
On the carpet:
Rug burns. Unavoidable.
Floor tiles & Hardwood floors:
They fuckin’ hurt!
Car front- and backseats:
Don’t try unless your car is a Hummer.
Barns:
You’ll end up scratching your skin off like a madman.
Public washrooms:
Unhygienic, unfomfortable, disgusting, not an iota of privacy, no matter how silent you try to be.
On the beach:
Moisture + sand = ? Guess what happens to your penis and her vagina. Ouch.
Fashion store changing cabin:
Unless you can keep quiet like a mouse and be quick like a rabbit, don’t do it. They are not half as private as they seem.
Feel free to complete the list with experiences of your own.