Human beings are not monogamous by nature, and statistically speaking men cheat for sex; women, on the other hand, cheat for emotional satisfaction, particularly women over the age of 30. A man does not mate for life with the first female he meets because it is believed, that he has a natural urge to “spread his seed.”
In committed marriages, of course, there is far more than just hormones and biology at work. Some men lose a sexual desire for their wives after children are born or even after witnessing childbirth. Their wives, to them, no longer appear as sex objects, but rather maternal figures.
Another widely reported cause is the breakdown of fun or spontaneity in the marriage. For example, to men in long-term relationships sex becomes routine or mechanical, not the adventure of the past, but simply as a means to an end. And so they seek that adventure, that adrenaline rush, with another woman (or women).
Some men feel a need to conquer because of ego; some men pursue sex outside of marriage simply to see if they can do it, carving a “notch in the belt,” simply to see if they can convince a woman to sleep with them.
On the other hand, some women do not cheat physically because they carry on emotional affairs – falling in love and becoming emotional intimate with a man but never taking it to the physical level. These affairs sometimes continue on for years, without ever being detected.
In long-term relationships, women, whether they work outside of the house or not, often find themselves “shut out” emotionally. Over 70 percent of women are the primary caregivers for their children as well as homemakers whether or not they have a full or part-time job. This means they enjoy little time for themselves to foster any natural urge to grow emotionally – an urge often ignored by men who want sex.