Yes, the divorce rate for Catholics is lower; those guys living in their Medieval fiefdom over there have been successful in that regard. But do you care to give us any statistics on cheating?
I doubt there is really any accurate way to determine cheating by religion, so let's not even try to go there.
From some of your earlier comments, I gather that you think that following a no premarital sex policy might result in the failure of one spouse in being able to identify frigidity in the other. What you are saying is possible, although somehow I doubt it.
Even if it is the case, that still doesn't disprove that as a general rule, premarital sex causes more problems that it could ever solve.