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I assume you are talking about our Hunter-gatherer ancestors based on the timeframe, but I'm not sure what you mean by serious consequences. Could you expand on that a bit?

I suspect monogamy as we know it is a response to the invention of agriculture, and we have closer relatives (the bonobos) who have sex much more freely than some of our other closer relatives.

https://www.nature.com/articles/ncomms11219

EDIT: Whoops I misread the abstract of the article, that doesn’t really give evidence towards my claim. However STDs did exist and I’m assuming people knew about them. Pregnancy itself would be a deterrent

For our female ancestors, yes. For our male ancestors, less so.

3 million? You may have missed some classes in school

Believe it or not evolution did not start with Homo Sapiens!