Hmm... This forum is not typically lucrative when it comes to personal ads. I've been on here for over a year and I just responded to one in my area for the first time!
Are you on OK Cupid? I'm not, but it does come highly recommended around here.
Having said that, I want to tell you how I personally feel about "all this":
Polyamory and "alternative lifestyles" are all just grooovy (with 3 o's), but consider yourself extremely fortunate that you have ONE good relationship, which is a more than a lot of people have. Every day I am thankful for my husband, and if that is all I get for the rest of my life, I will have nothing to be sorry for.