If your spouse goes out sometimes with his/her friends and doesn't come home, you should feel rock solid confident that they are sleeping on a buddy's couch and not shacked up somewhere and that they will call you as soon as they wake their drunk *** up. No, I havn't done this (have I?) but if I did my wife/me would be ok with it occasionally. We have only had one fight, ever, years ago and neither one of us even cares what it was about.
You just don't say mean words or things to someone you love and we never piss each other off on purpose.
I know this is rare, but I feel that if your spouse is not your best friend and you don't have this kind of love and trust in your relationship you're wasting your time. Is restricting her movements or making her stay at home, no facebook, no myspace etc. really going to make her love you more? I don't think so.
Just my humble opinion.