A man was prescribed Viagra by his doctor who told him to take it one hour before the act.

The man collected his prescription and went home to wait for his wife to get back from work.

An hour before she was due home, he took the Viagra pill.

But just as he was expecting her, she phoned to say that she wouldn’t be in for another two and a half hours.

In panic, he phoned the doctor. “What should I do?” he asked. “I’ve taken the pill but the effects will have worn off by the time my wife gets home.”

“I see,” said the doctor. “It is a pity to waste it.

Do you have a maid?”

“Yes.

“Well, could you not occupy yourself with her instead?”

The man was silent for a few seconds, then said, “but I never needed Viagra with the maid.”