Why do guys fall for some girls but not others?

Online dating for many years. I can say I've had many guys who had fallen for me. Out of every 10 guys i meet, 8 would fall for me. On the other hand, i have heard girls complaining that its so hard to find a guy that likes them. I just feel like its weird cuz i never really had a similar problem with guys.

Why do guys fall for some girls but not others?
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