I'mma answer this question.Omg. Why is this so important? Why are such precise details so vital to your self esteem?
Makes me dry up and like men just a little bit less every time I read one of these needy, one-note "size-is-is-so-important-women-are-lying-bitches" threads.
Men's genitals are outside. For all to see. There for since we can see only men's genitals, we only see 1 party whom is responsible for the mismatch of sizes. Women's vagina cannot be seen, thus it is not really considered most times.
Comes down to man being too big, too small, or just right.
Looseness for women is more of a slut shaming thing. No one uses genital size for slut shaming men.
Thus since the responsibility for a positive fit puts forth most of its weight on men(which I don't agree with it being this way) It is more natural that men are going to be the more fixated party when it concerns the SIZE of their genitals.
Being small is shit.
Average is ok
Big is looked as a positive thing. Even too big: Its like a slap in the face but it comes with a cupcake you can happily gnash on in the form of either ego booster or mitigated ego damage.
Sooo No one wants to be thought of as inferior, not good enough, too small, etc etc etc etc.
Thus knowing not all women are built the same or even how the fuck women are built in the terms of depth in general.
Men want to know the answer. To find out if they are good enough. AS IS. Not with compensation (imo shit every man should be doing anyways) They want to be good enough for the opposite sex. They want to be thought of as pleasurable, greatly so.
Men generally like numbers. Something definitive. Not huge fans of vagueness. Vagueness tends to fuel the insecurity.
Maybe that sheds more light on to why. There is more to it .... but I got tired of typing/my food is ready for consumption and I'd rather be stuffing my face with something delicious than talking about something that has been talked about more times than characters have left my fingertips.