Feeding the hairless pony
Providing pre-coital nourishment via the fingers to a young lady who hasn't been ridden in a while, only to find that she is already prepared and de-haired.
Before i mounted her i had Jeeves check she was in good condition as she had clearly been 'out to pasture' for too long. He held out his hand hand with his fingers splayed and the next next thing we knew he was "feeding the hairless pony"! She went at it like a horse eating oats