Martian Sex

It's 2022 and Mike and Maureen land on Mars after accumulating enough
frequent flier miles. The first thing they see is a Martian couple.
Mike and Maureen naturally want to know how they have sex. She goes
straight to the point: "So how do you guys do it?" asks Maureen. "Like
you do, I think," says the male Martian, "but maybe we'd better check
it out to be sure!" So, after some discussion, they all agree to swap
partners for one night.
Maureen and the male Martian go off to a bedroom where the Martian
strips. He's got only a tiny penis about half an inch long and just a
quarter inch thick. "I don't think this is going to work," says
Maureen, disappointed beyond belief. The male Martian looks puzzled.
"Why not?" he asks, "What's the matter?" "Well," she replies, "it's
just not long enough to go inside me!"
"No problem," he says, and starts to slap his forehead with his hand.
With each slap, his cock grows till it's actually pretty long. "Well,"
she says, "that's very impressive, but it's still quite narrow...."
"No problem," says the male Martian, and he starts pulling his ears.
With each pull, his cock grows wider and wider until it's huge! "Wow!"
shouts Maureen, before they fall into bed and make mad, passionate
love.
Next day the two couples rejoin their normal partners and go their
separate ways. As they walk along, Mike says to Maureen, "Well, was it
any good?"
"I hate to say it," replies Maureen, "but it was pretty wonderful. How
about you?"
"It was horrible," says Mike, "all I got was a terrible headache. She
just kept slapping my forehead and pulling my ears."