This is one of those jokes that may even have evolved from a real-life situation. I've tried to keep the American-speak as true to the original as possible to maintain the atmosphere:
So Joe drives to his friend Mike's place to pick him up for a game of tennis. Now, Mike's a good looking guy but he's the runt of the family. His two sisters, Emily and Jane are Hot El Supremo! And what do ya know, Emily and Jane are visiting. So, Joe arrives and Mike is running around like a maniac with his shirt half on, looking everywhere for his racket.
Mike opens the door and immediately ducks off, calling out:
"...Sorry, Dude. My sisters are here and they've been hogging the bathroom bein' girlie, they've moved everything around...I don't know where my racket is. Can you go upstairs and grab my shoes for me? They're in my closet...I think..."
Joe thinks to himself:
"Sure, if you want me to meet'n'greet those lovely laydeeeez, I'll do whatever you like."
So, up the stairs he goes. He walks into Mike's room and what should he see but Emily and Jane, lounging around, half-naked, wrapped only in a towel each.
The moment they see him they shriek but he immediately calms them down, as a a crafty idea hatches in his devious mind.
"Laydeeez, laydeeez, there's no need to panic. I'm Joe, Mike's best friend. He says you're driving him mad with all your girlie stuff and I've been ordered to have sex with both of you, now, to calm you down!"
Irate, fiery Emily snaps at Joe:"He would never..."Joe holds up his palm and interrupts her."No, really, I'll prove it..."So he shouts from the bedroom"Mike, both of them?"Mike calls back:"Yeah, sorry they're a bit smelly but they feel really great when you slip into 'em..."The girls look at each other with increasing horror as Mike continues:"And I'm sorry, but we're gonna have to play with YOUR balls, this time."
Andrew Goulding