When you don't use a condom.
Doctor responds: "Heavy drug use, ma'am" Widow: "But doctor, my husband didn't use drugs!" Doctor: "I know, but I did"
I don't know but that reminds me of a similar joke my uncle used to tell...
Finding 1 dead Baby in 100 trash bins.
1 or 2? 1... or 2?
Conception
A condom.