A survey of women says the lack of compliments and the absence of acts of kindness from their spouses is the top reason they will cheat.
In this survey of 11 thousand women, 84% of women complain about their partners not giving them enough attention and compliments. Whoa. That lack of compliments has 61% of women admitting this causes discussions and tension within the couple. A whopping three quarters of the women responding admitted that this behavior is the primary reason they strayed and wound up cheating on their husband.
It seems like the easy solution would be to be nice and once in a while (or even more often) tell your wife she looks great.