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I don't think you're an economist.
i'd estimate about 1 in 100 men can sleep with any woman they want and 1 in 20 can easily sleep with quite a few
and 3/4 of women can sleep with any may they want, using these numbers which are approximately correct things can and do work out like I say they do. 1 in 100 or 1 in 20 is a lot of people and men can have a lot of sex. Look at the stats on how much gay men do, or have done, if you want some enlightenment on this score.
(1) Your assumptions are quite strange. First of all, there are many people out there who would not sleep with anyone except their SO. Period. So, "1 in 100 men can sleep with any woman they want" excludes all the women who won't cheat on their SO's.
(2) 1 in 20 can sleep with "quite a few." What is quite a few?
(3) Both (1) & (2) assume that these men have some sort of looks/personality that makes them irresistable to the "average woman." They underlying assumption here is that pretty much all women want the same thing out of men, and that a particular type of guy can get ANY woman to sleep with them. This betrays an incredible generalization on your part, don't you think? Women have different tastes in men.
(4) 3/4 of women can sleep with any man they want. Again, this is pretty generalized and misandrist. You're pretty much saying that any man (let's just limit it to single men) will sleep with 3/4 of the women out there, no matter how annoying, arrogant, stupid, intimidating, thin, ugly, etc. the women are. I think most men who respect themselves would be quite offended by that. Just like women in part (3) have different tastes in men, men have different tastes in women.
(5) Even assuming that parts (4), (1) and (2) are true, does that mean that men and women do sleep with every man or woman they can sleep with? Absolutely not. Your theory still doesn't explain why men report having almost twice as many partners, on average, as women do.
I think your little theory is just self-serving BS to help you live with your low numbers.