Allow me to disagree on this: the harsh truth is that the less sexual relations you have, the more the chances to get divorced later on, leaving your wife and family at age 50, for a 2m tall hot babe from Russia(and you turn out broke!)
On the other hand, of course there're people that can be very happy together and have a wonderful marriage and none of them cheat the other throught their lives.
Anyway, with all due respect, I'm not telling you that going with strangers is the right thing for *YOU*, personally, to do, because every personality is different.