Fishing
A man and his newlywed check into a mountain resort by a lake. The desk clerk notices the "Just Married" sign still on the car. As soon as the man gets the luggage out of the car, he hops in a boat to go fishing.
He is out all day, comes back for a quick supper, picks up his lantern and goes back out at night. This goes on for a couple of days when the man happens to stop by the desk. The clerk starts a conversation with the man and mentions his behavior:
"I know it's none of my business,... but I was wondering why you weren't having sex with your new wife."
"Oh, I couldn't do that; she has gonorrhea."
"Well, what about anal sex?"
"Couldn't do that; she has diarrhea."
"There is always oral sex."
"Nope, she has pyorhea."
"Wait a second. If she has gonorrhea, diarrhea, and pyorhea, why did you marry her?"
"That's easy. She also has worms, and I love to fish!"