Virtually any sane woman who is in love with her husband and believes in her marriage will not have affairs. She will rather think about buying a bigger house and better furniture. A lover - what for? Woman does not need to cheat as long as she loves her husband.
To actually cheat, woman needs to go through complete indifference oon her husband’s part as well as affection and love of another man. And only then there can be sex.
It is known that an unmarried woman does not usually look for sex, but emotional support. Yet, to get the needed, she has to pay with her body. Because what kind of a man would give emotional support to a woman without dragging her into bed (or, at least, trying to)?