Whilst the concept is definitely old fashioned, that doesn't mean that it is something that should be ignored or mocked. Being faithful to your partner is as relevant today as it ever was.
Before we got together, Brett and I were known to spread ourselves around. I'm not saying we'd entertain any guy with a heartbeat, we did have some degree of self-control, it's just that we both had our share of boyfriends. However, we were always both faithful to the one we were with.
We've now been together fifteen years and there is no way we'd be together that long without being faithful to each other. There have been times when temptation has been there to stray, when I could easily think 'Brett will never know' and go with some random guy I'd never see again. I love Brett far too much to do something like that.to him, and I know I would never want to be the one to be cheated on.
Even though marriage wasn't legal when we first got together way back when, we still made a commitment to each other to have and to hold for richer for poorer etc. etc. and to forsake all others. I don't see how any couple can survive unless there is total monogamy.
When you offer your heart to someone there is always a risk of being hurt, but when it works the risk is so worth it.
I hope you find what you are looking for W_L