The sex of a fly?

My mother inlaw, Janet, walked into the kitchen and found my father in law, Stan, killing flies with a fly swatter.

Have you killed any yet she asked!

Yep 5 so far 3 males and 2 females.

Janet asked with a troubled expression, How do you know their sex.

Stan replied, that's easy 3 were on the beer can and 2 were on the phone!

Billy Mac ;D
 
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