There is a joke, using the nose as a metaphor?

The son asked his father: Is it comfortable for a man or a woman when making love?

Dad replied, if you pick your nose with your fingers, is your nostrils comfortable or your fingers comfortable!

The son asked his father again, then why can't a woman have sex when she comes?

Dad replied: If your nostrils bleed, will you continue to pick your nostrils?

. . .