Shortly before her fourth marriage, a middle aged woman went to see her doctor to ask for advice on sex, more particularly on how to do it.

The doctor was amazed. He said, "You've been married three times before, surely you know what you have to do by now?"

"No, that's the point," said the woman, "I don't. My first husband was a gynaecologist and all he wanted to do was look at it; my second husband was a psychiatrist and all he wanted to do was talk about it; my third husband worked for the Post Office and he couldn't find it. Now I'm getting married to a lawyer so I'm bound to get screwed sometime!"