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I remember a study from a long time ago that showed that men that watched their partner with another person had a higher sperm count or more semen. The theory was that the higher semen amount would result in that person having higher chances of producing his own offspring. Basically the sperm of more than one partner would compete in the uterus for the egg. Might help explain why it exist in nature as a fetish. The more sperm the more offspring. Thus cucks get selected for. They also saw the same thing in animals as well. So that biological drive probably takes precedent over any feelings of jealousy.