Half of all marriages end in divorce. But some people get married and stay married, they constitue over half the married population at any moment. The same minority who have multiple marriages probably stain those same marriages with adultery. I suspect that adultery is relatively less common in long term stale marriages.
I think adultery is a sign that you don't take your marriage very seriously.
I think that number is a bit high, i remember a few months back medved did a thing on his program where he dissected the divorce rate. The fact that people who stay married get taken out of the statistics at some point makes it higher than it actually is. I beleive he said divorce rate is closer to 30%.
Best Freudian slip of the week. You did mean to say 'stable', did you not?
-ccm