You can't POP Your Cherry! (HYMEN 101)

[jakeXT]

23. I was expecting something on estrogen

As the body changes, so does the hymen. Before puberty, a girl’s hymen
is often crescent-shaped, although there are certainly variations. The hymen
is stretched across the opening of the vagina and it is almost translucent.
You can actually see some of the capillaries in it and it covers much of the
opening of the vagina.
By the end of puberty, the hymen no longer drapes across the opening
of the vagina, but becomes more like an O-ring or collar, allowing a penis to
have full entry. This change is due to the impact of
estrogen on the hymen
tissue, which has estrogen receptors in it just like the walls of the vagina.
Since the
estrogen makes the hymen more elastic, our modern notion that
the hymen “pops” like a cherry during the first intercourse is silly.

http://www.90secondsonsex.com/pdfs/hymen.pdf