[stands2reason]

Guys, I'm going on the record as saying that is not one of the secret places normal women have to shave. The only time I've heard of it on women is occasionally in late pregnancy a women will have a faint one accompanied by a darkening of the skin (melanin) along the "trail." Those are NOT normal.

[TheSpottedOwl]

Yeah I know, I'm a girl :-) That's why I think they could be perhaps "hormone challenged". These girls need estrogen patches!

[Tredge]

"The only time I've heard of it on women is occasionally in late pregnancy a women will have a faint one accompanied by a darkening of the skin (melanin) along the 'trail.'"

That certainly would give the one on the left an excuse, but shouldn't she have an outie? She's got a bleedin' echo chamber there, a veritable black hole from which neither light nor matter can escape. If I put my head in there I'd find myself in an altogether different part of space and time - they'd find me on the Hubble telescope one day: "Hey, it's a Star-Baby!" "That's not a Star-Baby you dolt, that's the guy who stuck his head in that nasty girl's navel - you know, the one with the HAPPY TRAIL?"