I'm betting on dating sites and the internet in general. Our evolutionary biology is for the women to only get pregnant by the fittest available male in the "tribe" because it's such an investment in time and resources (also why men are inclined to go around with whoever they can, it's all benefit and no cost to "dine and dash"), and now the "tribe" we percieve is artifically extended with the fittest possible specim…
You might want to read The Moral Animal by Robert Wright for a more nuanced view of human nature by an evolutionary psychologist. (A field which is controversial at the best of times- but if you're going to believe something controversial but possibly true you can do a lot better than what you posted here)
If I wasn't on my phone i'd type more, but in brief you have a weird idea of what fitness means for a woman looking for a mate. It doesn't necessarily mean "big muscles" but could mean something like a guy who loves her and will raise the kids with her. Because that's optimal for passing on genes.
Furthermore fitness for a male in search of a woman might mean a guy who is monogomous and caring (because faking those traits to manipulate a woman might be too difficult) because he can convince a woman to mate with him because he will help her with the kids.