A woman walked into the kitchen

A woman walked into the kitchen and found her husband walking around with a fly swatter.

“What are you doing?” the woman asked.

“Hunting mosquitoes” He responded.

“Oh, catching any?” She asked.

“Yep, two males, two females” said the husband.

Intrigued with this information the woman asked:

“How can you tell?”

Her husband quickly responded:

“Two were on a beer can, two were on the phone.”