Not quite the same i know but years ago a mate and I were in Amsterdam, and we were looking round the RLD. The girls in the window were doing the usual sales routine, and we were stood chatting to this one lass. To be honest, she was rough as fuck and we wouldn't have gone anywhere near her, but it was entertaining enough to talk to her.
"Come on babies, I'll do you both for a discount. At the same time if you want" she said to us.
At which point, a Scottish bloke walked past, muttered "I would nae bother lads, your cocks will drop off in a week". Harsh but funny.