I disagree based on the supporting evidence that pre-eclampsia has an even higher correlation of occurrence for the future of potential mothers with every encounter with a new males sperm. Sure, we have medicine and medical techniques to help women with pre-eclampsia, but ultimately, pre-eclampsia is very dangerous. Semen supresses a woman's immune system so that the fetus is less likely to be rejected during implantation. Engaging in sexual relations with multiple male partners (exposed to semen) for women has a negative impact on her immune system. Eclampsia that may stem from pre-eclampsia is fatal. If monogamy is SOOOooOOO unnatural, then why would nature endanger the lives of pregnant women who slept around or suddenly change sex partners with life threatening and longterm damaging (pre)eclampsia???? Men don't get (pre)eclampsia, women do. Maybe, monogamy has become partly more prevalent due to a natural weeding out of promiscuous women before they could go on to have more children and pass on certain nonmonogamous genes. Maybe, the condom, birth control, and modern medicine have given people a false sense of "natural".