The year is 2222, and a human couple are taking their first trip to Mars.

While there, they meet two Martians and the four of them get talking. They discuss the differences between Earth and Martian politics, technology, society - until finally the conversation turns to sex.

"Just how do you Martians do it?" asks the woman. "Pretty much the way you do," respond the Martian couple. After a few drinks, the four of them decide to try out a wife swap and check into a Martian motel.

The human woman and the Martian male disappear into the first available room, and he strips instantly to reveal his teeny weenie. "I don't think this is going to work," sighs the woman. "It's just not long enough." "No problem," bleeps the Martian, and proceeds to slap his forehead with his palm. With each slap, his weenie grows another inch, until it's really quite impressive.

"That's definitely an improvement," says the woman, "but it's still pretty thin..." Immediately, the Martian starts pulling his ears. With each tug, his weenie widens until he measures up nicely. "Wow!" exclaims the woman, "that's the biggest I've seen".

The next day the couples meet up with their partners and go their separate ways. "How was it for you?" the man asks his wife. "I hate to say it," she replies, "but it was pretty mind-blowing. How about you?"

"Horrible," he replies. "She kept slapping my forehead and pulling my ears."