"Contrary to popular belief, the vagina is not 'sealed for freshness' with an iron hymen. It isn’t brittle, it does have openings, and the vaginal corona looks and feels different for each woman. For those of you unfamiliar with the term 'vaginal corona' please allow me to back up. The term 'hymen' is not actually a biologically sound term because it implies a solid piece of tissue that ruptures or breaks upon penetration. This is not the case. A 'corona' is much more accurate for the mucous tissue just inside the vagina. Some women do have thicker and stronger coronas that may require medical intervention to help reduce pain in penetration whether that is for sex or for menstruation. Some women have very small, thin, and nearly transparent tissues that never causes them any pain or problems. Like every other part of our body, it is unique to us. The presence or absence of a 'hymen' does not indicate virginity."
The above quote is from Maggie's post Virginity, which, among other things, brilliantly discusses the implications of Kink.com's coverage of Nikki Blue having penetrative, vaginal sex ("losing her virginity") for the first time, on screen. Also note the comments section, where Peter Acworth speaks politely and astutely on behalf of (NSFW) Kink.com.