A bloke goes into his local chemists and asks for some KY Jelly.
Assistant says "I'm sorry sir, we don't sell it. Have you tried Boots ?"
Bloke says "I want to slide in - not march in !!"
It's amusing how jokes evolve. When I first heard this one it was contraceptives not KY, and the punch line was "no good, it comes through the lace holes"