Whay are married cheating men considered to be pigs when married women are only 5 points behind them?

Seeing that 50-55% of married men cheat and 45-50% of married women cheat, how come the stereotype lives on that men are cheating pigs? There is only a 5% difference in the latest statistics and the trend for females to cheat is on rising. Do you think the closeness is because men are cheating less or because women are cheating more. These stats are for married people that are suppoedly in a committed relationship. Most affairs occur with co-workers, is it because of an increase of women in the workplace? Is it a decay of morality in our social norms and infidelity is nolonger a big deal to so many apparently?