First off. It is my belief that the best relationship is an open one.
The first and most important reason for this if because we all want to spread our genes around it is natural instinct. the reason cheating breaks up relationships is because people dont accept that we all want to have lots of sex. That our bodies demand that we have lots of sex. with different people too!
Secondly. You may never stop loving a person but you may get tired of having sex with that person.
how many times have you seen a relationship break up over cheating when both parties still loved eachother? You know the classic:
Girl: Why did you cheat on me how could you?
Boy: it just happened! i still love you!
Girl: No you betrayed me etc etc etc
Now. it is fairly fucking obvious that the love is still there why focus on the sex? obviously the sex was just that, sex. sex doesn't equal love. there is no betrayal when you are just trying something new, adding a bit of spice to your sex life.
Thirdly. what if your girlfriend doesn't want to do anal? or blowjobs? or tie you up? or do any other one of your sexual deviancies? well great. due to the stupidity of exclusive relationships you either have to repress your desires or cheat on her. awwwesome. however in an open relationship you may now go out a fuck that girl in the ass like you always wanted to and still go back to cuddle with your girlfriend that you love.
me and my girlfriend are in an open relationship. its fucking great. i couldn't see myself in any other position. when we go out to parties we dont have to care if our partner is getting pissy because w've been getting to close to that hot chick in the corner.
also. she doesn't get awkward in threesomes :)
yeah. marriage is retarded too.