Two Irish men, a Protestant and a Catholic are sitting in a pub talking about birth control.
The Protestant says to the Catholic, "My religion allows me to use a condom when I make love to my wife but your religion does not. Yet I've got 14 children and you have only two. How can this be?"
The Catholic replies, "It's quite simple, I use the safe period when I make love."
"And when is that?" asks the Protestant.
"When you're at work." replies the Catholic.