She's Trying To Take My Man - What Should I Do To Stop Marital Infidelity?

Competition for love. It shouldn't happen, but because of the enormous difference in the ratio of males to females, many women find themselves in the uncomfortable position of feeling like they must compete for the love of a man. Many women express anger at women they feel are not playing by the rules, "He's mines, get your own!" What should a woman do if another woman is aggressively trying to attract her husband? Ignore it? Reprimand him for appearing interested? Threaten divorce? Expect and accept infidelity? Beat up the other woman? Are there enforceable rules when it comes to love, or is it true that "all's fair in love and war"? Should women develop an official code of ethics between them to prevent marital infidelity?