Let's start that serie about the funny places to have sex. Keep iny that you should always be safe and in control of every parameter. Never go against the law and never be seen by children or fragile people!
Let's start with an easy place : the hotel.
It may sound lame and boring but just asking the clerc for the key or the room at a time none checks in is already exciting.
And the hotel isn't just about a room with your partner, some stranger, group etc... There is the corridor, the staircase, the lift etc....