Many women seem to assume that penis and balls are attached actually between the legs, just like where their vaginas are. They are surprised, if they're told, the whole assembly is actually more "at the front".
The reverse is also true, BTW. A lot of boys struggle finding the vagina because from their perspective it's waaay too low.
We barely understand our own bodies, it's not surprising that we have problems with other sexes bodies.
Hahaha, my second long term girlfriend was a bit...naive... tbh... We've been naked many times, but when we first went to a public sauna(which is textile-free here)she asked me exactly that.
Maybe it was the sagging old man's balls or something.
But she was somewhat shocked.