Why is it that when someone's husband, wife, fiance, fiancee, boyfriend or girlfriend indulges in sex with someone else, the person becomes very angry? Why is it such a big deal?
Here are some factors that came to my mind:
[list][li]Your wife/girlfriend/fiancee could get pregnant for the other person and give birth to a child that is not yours. Note: DNA analysis can be used to determine the paternity of a child.[/li]
[li]Your husband/boyfriend/fiance could father the other woman's child and consume resources that would have been used to take care of the your own children. Once again, we observe that such pregnancies can be prevented using various methods.[/li]
[li]Your partner could contact STDs or the HIV virus and pass them on to you.[/li]
[li]Your partner may spend a significant amount of money on the other person, therefore 'shortening your ration' (I guess this applies more to unfaithful men ...)[li][li]You feel bad because the infidelity implies that your partner is not satisfied with your 'performance'[/li][/list]
Ok, that's all I can think of. It sure seems as if the above 'disadvantages' of sexual infidelity are just too weak ccompared to the indignation that people display when they discover that their partner has been cheating on them ...