Half of the legal relationships in the states end a in a divorce, 65% of these breakups is due to cheating. The evidence below proves that, as you grow older, one of two things happens, either you get good at cheating, or you stop cheating.
Age* Women Men
Under 20 years old 27.6% 11.7%
20 to 24 years old 36.6% 38.8%
25 to 29 years old 16.4% 22.3%
30 to 34 years old 8.5% 11.6%
35 to 39 years old 5.1% 6.5%
*Age at time of marriage
Of course a third possibility is that your spouse becomes more tolerant of cheating.
Its most interesting to see that the divorce rate for men under 20 is almost 40% to that of women, my read is, either they are being picked up by cougars, or they are just too plain stupid and stick around for ever, women on the other hand at this age have startlingly high divorce rate, for obvious reasons, they want some ass!
However, I would want to for the record clarify that cheating is really going all the way, making out a couple of times, really does not count as cheating, and if some do consider it cheating, then they are making their own definition, which though they are entitled to, but they should not be judging others on this definition.