This is a serious question so only serious answers please.

My friend asked me the other day 'how many times do you have to fart before you're considered flatulent?'

I had no idea. He reckons he farted 22 times on the way to work the other day. Does anyone know the answer?

If anyone else has any other embarassing medical or anatomical questions they'd like to ask for themselves or on behalf of a friend then this is the thread to do it without fear of persecution.