From my personal experience, I have a feeling Infidelity may be a bit higher than other religions among JW's, and possibly a bit higher than among the general public ??
I knew of many cases in our own Congo. and surrounding ones. One big case happened in a close by Congo, actual wife swapping involving M.S's as well as ordinary JW's.
I was "offered it on a plate" at least three or four times, two were just horny sisters wanting me to shag them, maybe nothing more, one I got dangerously close to actually going ahead, it was flirting that led eventually to me being infatuated, but never did I weaken, I am so glad, to have sacrificed my marriage would have been the worst decision of my life. And I learned in the end that the girl I was infatuated with was an utter witch, and simply wanted out from her marriage. She engineered a Divorce, quite how I am not sure, her husband was a nice guy, before that had gone through she latched on to a JW guy about 10 years younger than her, and eventually married him.
One Elder said to me that " we have had every sin in our Congregation, except Murder". True for most Congos. I guess.