Bullshit!

So I'm reading in my Psych textbook and there's a little graphic about human sexuality and one of the things covered is infidelity.

15.1% of men and 2.7% of women have been unfaithful.

Bull. Shit.

There have been a lot of studies of over the years and I have never seen numbers that low. Did they ask the questions of respondents sitting in a room with their spouses, their parents and their spiritual advisors? Their attorneys maybe?