Okay so I did my girlfriends sister once before I did her and their vaginas were like the same. I have a friend with twin sisters and their vaginas are basically the same. Finally I played a truth or dare game as a kid with sisters who were 2 years apart and they had the same kind of vagina too. I mean can one sister be an innie and the other be an outie? Or are sisters genetically set up to have similar vaginas.
I would guess there is range. I know for a fact brothers can have significantly different penises - someone I know tells me her younger son who is 6 is practically bigger then his 9 year old brother.
For such a liberal website with a bunch of young contributors, I am shocked at the negative responses and attacks at the QA. I in no way interpreted this to be anything but a legitimate question. I have two sisters myself and have obviously seen them naked from time to time through out life and they were similar yes.