Excellent question that deserves a Awesome answer.. and i fell as a member of the werewolf community i can field this for you.
In short, in werewolf form out cocks are just so massively thick it all hangs out regardless. and thats before we get hard >3. Once that happens. and the knott forms, ur fuuuucked.
Hope you enjoyed this simple expiation.. and ill be see-in you next full mood >3 *licks lips hungrily*