One of those "You had to be there" moments:

A: You know B played the trombone in his high school band? You should get him to show you his blowing and sucking, not to mention his pulling.
B: Do you want me to blow you?
A: Maybe if you were the last guy on earth and then, I'd have to give you my answer.
B: Just make sure there's a trombone.

It doesn't look at all funny when transcribed but the incongruity of the last statement just sent me rolling onto the floor in laughter. Incudentally, yes, both are male.