Men are more jealous when are sexual cheated
In general, man is more jealous when they are sexual cheated, while woman is more susceptible to the feelings of the infidelity of her half! (...) Therefore, is likely, the male jealousy, to be an archaic mechanism that is meant to prevent the involvement of the beloved in sexual relations with another man, to limit this risk. So Jealousy will be extreme in case of the sexual infidelity.

