Normally cycling participants earned about US$335 per 5-h shift during estrus, US$260 per shift during the luteal phase, and US$185 per shift during menstruation. By contrast, participants using contraceptive pills showed no estrous earnings peak… These results have clear implications for human evolution, sexuality, and economics.
No they don’t.
18 dancers recorded their cycles and their tips to generate the above data. It should be pointed out that they didn’t record them very well: 25% of the 60 days requested.
But while these results are interesting– why did the women get higher tips, after all?– this is the part you want to focus on:
The fact that tip earnings peak during estrus suggests that men can detect female fertility more accurately than the “concealed ovulation” model suggested
Wow, that’s a jump. Seriously: why can’t the answer be ESP? Or the ability to detect thetan energy? There are a million reasons that every woman already knows why tips might be lower during menstruation and higher afterward. Whatever happened to “you can’t be sexy if you don’t feel sexy” and etc? None of them requires the man to know anything; only for the woman to be marginally in touch with her body. My experience with dancers is they are exquisitely in touch with their bodies. Perhaps there is even a mechanical explanation?
The question the paper is investigating is whether estrus- increased attractiveness and receptiveness near ovulation– which is exhibited outwardly in most mammals is also so in humans. Usually, you can’t tell if a woman is ovulating– but maybe you can?
This may be a legitimate question of evolutionary biology and psychology: are these women broadcasting estrus through “signals” and leaked cues?” But the proxies used to measure that– tips given by men who are paying for lots of things but decidedly not fertility– is logically flawed. So why use it?
Because the purpose of the research isn’t to answer the question, “do women broadcast estrus via signals and leaked cues?” but to to answer that question in the affirmative.