"Connecting Through the Wall" by Peter V. Principle (an347524@anon.penet.fi). Readers who are married with children will identify with this story. The man and his wife are vacationing with their children and want to have some romantic sex while the kids are sleeping in the same motel room. Many a time my husband and I have been glad to hear the air conditioner's compressor kick in to mask any noises we might make while we secretly fucked our brains out without letting our apparently sleeping daughters know that their parents were in heat. The protagonists in this story have the same problem, and they solve it the same way we did.
Afterwards, the man awakens and hears noises in the room next door. Apparently another couple is making love there. The narrator vividly describes his own reactions and activities as he listens and imagines while these adjacent lovers consummate their union. It's pretty hot stuff.