Male & Female Flies..........

A woman walked into the kitchen to find her husband stalking around with a fly swatter.
"What are you doing?" she asked.
"Hunting Flies," he responded.
"Oh!, Killed any?" she asked.
"Yep, 3 males, 2 Females," he replied.
Intrigued, she asked. "How can you tell ?"
He responded, "3 were on a beer can, 2 were on the phone."