An elderly gentleman went to the local chemists and asked the pharmacist to repeat his prescription for Viagra. "How many do you want?" asked the pharmacist.
The man replied, "Just a few, maybe a dozen. I cut each one into four pieces."
Upon hearing that, the pharmacist said, "That's too small a dose. That won't get you through sex."
The old fellow said, "Oh, I'm past ninety years old and I don't even think about sex anymore.
I just want it to stick out enough so I don't pee in my slippers."
Lol the version I heard was that the man who always peed on his slippers went to Specsavers in the end because he had double vision and always went for the big one.