According to this Huffington Post columnist, women are smarter than men at infidelity, and they are catching up to men in prevelance.
The GSS asked respondents if they ever strayed. I divided answers into two periods: 1991-1998 and 2000-2010. In the first period, 23.0 perent of men and 13.1 percent of women cheated (sample size = 8,103). The difference is statistically significant.
In the second period, the figures are 23.4 and 14.5 percent (sample size = 9,304). Again, men are significantly more likely to be unfaithful than women, but the latter estimates for both sexes are not significantly higher than their respective numbers from period 1. The GSS does not support the view that women are catching up with men. And I don't have any data concerning the cleverness of female cheating.