When a teenage boy and his grandfather go fishing one day, the old
man starts talking about how times have changed. The young man
picks up on this and starts talking about the various problems and
diseases going around.
The 'teen says, "Grandpa, they didn't have a lot of problems with all these diseases when you were young did they?"
Grandpa replies, "Nope."
Teen says, "Well, what did you guys use for safe sex?"
Grandpa replies, "A wedding ring."