Purely subjective, but I'll take a stab:

I think far fewer people cheat than most "polls" would suggest.

More men cheat than women, but it's in our genes to try to try to have as many offsrping as possible. Not so for women.

So I'd say

men: 30%
women: 10%

I've never cheated on anyone I was in a commited realationship with and haven't been cheated on by anyone-- I hope!!

__________________

Current:
2014 VW Tiguan SEL 4Motion 43,000 miles.

2016 Hyundai Santa Fe Sport (wife's).

Past:
2006 Jetta TDI 135,970 miles. Sold Nov. '13.
1995 E-320 Special Edition. 220,200 miles. Sold Sept. '07.
1987 190-E 16 valve. 153,000 miles. Sold Feb. '06.
1980 300-D 225,000 miles. Donated to the National Kidney Foundation.
1980 240-D manual, 297,500 miles. Totaled by inattentive driver.