YANBU, men DO cheat more than women do. Especially moreso as the marriage/relationship progresses, and they get bored of the humdrum of many years with the same woman, and the drudgery and monotony.
And also, men cheat just for the sake of it, coz they're bored, for a cheeky sly fuck with someone else, and for the thrill and excitement of it. Women won't generally cheat unless they are unhappy in their marriage/relationship, and would not mind it ending.
Many men are also very adept liars, and many won't admit to cheating, even when they are faced with concrete evidence. And when they ARE properly snookered, they will find new and creative ways of blaming their wife/partner.
But some men will say that men can't help it, because men have a 'natural urge' to spread their seed to populate the human race.
Funny really, coz the 'seed' of women is needed just as much to populate the human race, but women don't shag around like men do. 
As for the 'men are generally having affairs with women' so the figures must be equal. Not so. Many men have affairs with single and divorced women, and prostitutes. Many of them do not have affairs with other men's wives. Funny really, coz women think nothing of having affairs with other women's husbands.
This thread is going to fill up with women saying their man has never cheated, (but they have,) and men saying THEY have never cheated but every woman they have been with has. 