I'm about to solve this flappy/flaggy labia evolutionary thing.
No, I think it has to do with minnows/small fish and their cleaning action/attraction on exposed human parts underwater. And what genotypes hail from areas where rinsing off in a river is normal.
May I ask, does your labia spread out, you know, like you could tack cuff tacks to each side? Trying to see if saucer-nipples such as yours - very nice, btw - correlate to .. extroverted labia.
These wing-flaps that are all the rage these days, you'd know 'em if you had 'em, they look like some sort of symmetrical fancy napkin folds or something,