There are social consequence to sexual behavior.
If the consequences didn't exist, behavior and the long term happiness as a result of that behavior might be different.
I think you are wrong about the nature of monogamy, especially as it has allowed females to provide for their offspring. The study I was thinking of contrasted the different evolutionary benefits to males and females of monogamy vs. having multiple reproductive partners if you look at the evolutionary "goal" of getting your genetic material into the next generation. Females benefited from one long term partner providing material support to allowing offspring to reach reproductive age. Males benefited from getting the sperm out there to as many different females as they could.
How in the world could you imagine that there is no legitimate scientific knowledge in the area of mating habits and their benefits?
ETA: I wish I had quoted. It seems like I either misread or there was a pretty big change in the second section.
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