The only reason this makes sense to you and a lot of other dudes is because you view sex as the most valuable thing a woman has to offer you, the end all be all. There are many aspects of a relationship that are more important that seeing the value of your partner as a fukk hole.
It's an idea which is frankly misogynistic in nature and not sourced in good intentions, but rather insecurity and the un-personification of women as humans with emotions, needs, and wants.
When you think about it, it's really the equivalent to a white man's sub-homoerotic obsession with black men's dikk. Gotta make sure she hasn't had any/too much, or she's tainted.
It's crazy that men in here are seriously astounded, every time, that women like sex. Women are human and enjoy sexual gratification just as every one else. They are no better than anyone/any male. Stop placing them on the highest shelf as if they are any better. You treat them like Disney movie characters or inanimate objects and then wonder your views/what you think should be never match up with reality.
Not trying to be condescending, but maybe if you had more of it (sex), you'd realize that shyt ain't really that big of a deal, unless the chick is fukking your best friend or somethin'. If you're worried that some random dude is gonna be able to say he had your chick, get over it, because only lames and insecure dudes who don't get sex that often think it's a big deal that a woman had sex with them to the point where they have to run around and tell everyone as if it's something bad.
If you're trying to make a human into an angel, it just ain't gonna work. Get over it.
------
I think women would definitely be more open about their sexual exploits, but it's dudes like many on this board who are so apt and thirsty to judge, that they never will.
Be mad about women holding secrets and then as a reaction shame them into holding secrets brehs.