WHY WOMEN CHEAT?...WOMEN ARE ACTUALLY BETTER CHEATS THAN MEN IN BOTH CHEATING AND HIDING...

Most studies suggest that somewhere from 10 to 20 percent of men and women in marriages and other committed monogamous relationships will cheat on their partner at some point.
It Takes Two to Tango
Women are better at cheating and hiding it then men.
Women tend to be more aroused by sexuality that includes or implies some form of emotional connection as with romance-oriented erotica such as Fifty Shades of Grey and Twilight, both of which have primarily female audiences.
women who cheat are much more likely to want and/or need an intimate emotional bond with their affair partner — even simply to believe they have such a bond, though the man may feel differently.

Women who step out on a husband or significant other — male or female — do so for any number of reasons, the five most common of which are listed below:
Why Women Cheat?In truth, some women cheat because they receive little sex or physical intimacy from their spouse. After all, healthy adult women enjoy the physical act of sex as much as men do.
1; She feels underappreciated, neglected, or ignored. A woman who feels more like a housekeeper, financial provider, or nanny than a wife or girlfriend is more vulnerable to finding an external situation that brings attention and appreciation for who she is rather than the functions she performs.
2; She craves intimacy. More so than men, women feel valued and connected to their relationship partner through non-sexual emotional interaction such as touching, kissing, cuddling, gift-giving, being remembered, and most of all meaningful communication.
Women who aren’t getting their intimacy needs met by a primary partner may look elsewhere, trying to meet those needs through sexual/romantic relationships.
3; She is bored and/or lonely. Women who find themselves alone at home for long periods of time, perhaps when caring for young children or even after children are grown and gone, can feel that their lives lack meaning, and they may use casual sex or deeper romantic affairs to fill the void.
Women who have spouses or partners who are absent for long periods of time related to work (military service, for example) may also turn to sex and affairs to fill what feels like an untenable emptiness.
 Those who are more narcissistic and emotionally immature may expect a significant other to meet their every single need, and also to be a mind-reader in terms of knowing what those needs are. When their human and imperfect partner inevitably fails them, they feel justified in seeking attention elsewhere.
She has an intimacy disorder.
 Early childhood trauma and/or sexual abuse often lead women (and men) in adult life to problems with addictive sex and/or serial cheating. Such women repeatedly seek emotional intensity rather than relational intimacy. Women with unresolved childhood trauma as well as those with emotional instability — women who carry an uneven and disjointed sense of self — can seek consistency and feelings of importance through intensity-based romantic and/or sexual activity.

By Robert Weiss