There are some very good thoughts here...

I used to think that I yearned to be in a relationship more than anything else. But everytime a relationship hits a couple years, the feeling wears off. I don't know if this just me or if it is universal. However, since I have a great partner, we have decided to open up our marriage instead of being miserable because the passion is gone. And just knowing that we are free to date and free to look (as long as we are communicative, honest and safe) has brought back the passion in our marriage. I think it is society's illusion that perpetuates being able to love only one person at a time. I feel capable of loving and giving myself to several people at a time and I do. Being married is not all it is cracked up to be - its really just a piece of paper. But being friends with and being partners with other honest loving human beings can be a wonderful thing.