LOL at this thread!
DS is almost 7 and was sitting on the loo yesterday doing a poo and I got called in as he apologised that he had wet the floor - "I was having a wee when I noticed that my wily was all stiff and pointing out of the toilet and not down so I wet my pants and shorts and the floor - sorry mummy!" So I asked why it was stiff - "I don't know Mummy - it just was" was the reply.
He does the pulling foreskin back too and stretching willy and asking me to bite it and massage it etc.
I had 3 sisters - have never had to deal with willies!
Oh - my Mum used to look after a little boy and when he discovered his willy he didn't like it and tried to crawl away from it!