since he has never taken a deer,explain that if he wait for a buck(with only two days to hunt) he may not get the chance. as scbuch said that is really up to him.
if he get the doe,then maybe he will want to hold out for a real big buck later.
his chose,but you may be able to help hin deside.

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.