Bus driver.

The impotent bus driver goes to see his doctor. He wants some Viagra,
But he doesn't want his wife to know about it. The doc prescribes it
For him; he heads to the pharmacist, who fills the prescription. Home
Is a good hour away so the bus driver quickly downs one of the little
Blue pills. When he gets home, he doesn't even have to tell his wife
With words. That twinkle in his eye speaks volumes. They tear off
Each other's clothes and are quickly in bed. He manages to "rise to
The occasion" three times. Three times! He expects his wife to be
Delighted, but instead, she seems rather sad. "What's wrong, dear?"
He asks "I think your job is taking over every aspect of your life
And it's doing you in," she sighs. "What do you mean?" "I mean, even
Our sex life is like the bus service. Nothing for ages, and then --
Three come all at once!"