Just because a husband's touchy-feely doesn't mean his marriage is on firm footing."When a man starts cheating, he becomes hyperactive sexually," says Rapini, explaining that his sex drive has been awakened, and his wife is still the one with whom he feels most comfortable sexually.If you notice a sudden change in your husband's sex drive, it should raise a red flag.

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Fact #7: A wife often knows her husband's cheating.

How could Tiger Woods's ex, Elin Nordegren, and Arnold Schwarzenegger's ex, Maria Shriver, not have known what their high-profile husbands were up to?

"We more often think of women complaining about a lack of romance, but men feel it, too," says Dr. "They frequently suffer in silence, believing they can't get what they want from their spouses." To avoid this in your marriage, plan nights out together, set aside time for sex and discuss hopes and dreams—not just workdays and your son's last soccer game. Cheaters don't generally pick up random women in bars.

"My first husband cheated on me with a childhood friend," says Diane* from New York City.

He explains women are more likely to cheat for emotional satisfaction.

"Online cheating—without any physical contact—is the most damaging type of infidelity," says Orlando.

"After the affair is solid, he may begin to pull away," says Rapini.

Fact #6: Women cheat just as much as men, and their affairs are more dangerous.

A good idea: Make sure your husband feels more connected to you than to his business partner.