A man was having an affair with a married woman. When her husband had gone to work, her secret lover came 'round. Just as they got down to business, the door bell went. The woman went and peered out of the curtains to see who it was.
"Oh no, it's my husband, he must have forgotten something."
The woman went downstairs, and the man jumped out of the window before he was seen. He was totally starkers, so hid behind a bush. About an hour later, a nudist group ran by, doing a marathon. He quickly jumped up, and joined them.
After a while, he got talking to one of them, "So how long have you been a nudist?" a man asked him.
"Not long" he replied "what about that?" the other man said to him, pointing to the condom the man was wearing.
"Oh, it was raining when I came out" the man replied.