Men are quite happy peeing in front of other men. ....Many men indulge in a spot of light-hearted willy waving when they come out of the shower, women will often scuttle past with a towel around them.
The way a lot of women on MN imagine men is very entertaining. This particular gem is akin to the sterotype of what women get up to on sleepovers.
Men are just as insecure about their bodies as women, and just as varied in their feelings on these subjects.