i saw my ...... naked, once, by accident.
but, the most memorable event happened when i was a teenager.  one day, i stayed home from school because i was sick.
in those, doctors made house calls. because i had a, significant, fever the Dr told her to rub me down with alcohol.  this was supposed to reduce the fever until he got there.
i had removed my clothes & while she was rubbing me down,  as she approached my groin, she commented you look just like your father.
 i had no idea what she meant, & 50+ years later i, still have no clue.