I think that depends upon the woman he is cheating on. I have had more than one oppertunity to cheat in my life (on my GF’s) and never have. Usually because I didnt need nor want the drama it would eventually cause in my life. Your sinario basicially is just a ‘without all the drama, would you…’ question.
Having said that there has been two women in my life who so fully consumed me that even though I was presented with the oppertunity to in both relationships, I never even considered it. With them, I was that 5%. With the others, I was the 50%. I think the ratios you give are a testement to how many people marry for love, marry for convience (social pressure) or marry for necessity (shotgun wedding 2010); and not a refelection of male personalities per se.
(please dont take this as a ‘blame the wife’ post, it most certainly isnt. its a ‘You dumbass, you married the wrong woman post.)