I can reply somewhat from an observer's standpoint.
When I was a teen there was a family in the area that was about 50/50 large and small - dwarfism was on the father's side. They had 5 children, three of them boys, two of which were small people.
The boys were around my age and were part of the summertime gang of baseball, hanging out and skinnydipping. I remember the 'little' ones being proportionally packaged (if somewhat large compared to their size but not outlandishly).
Pecker
I know a guy who always has sex on his mind and once a month, just like clockwork, he gets a nosebleed.