I have just started a new site with extensive contact opportunities as well as articles and discussions about polyamory. www.LoveTriad.org. Check it out -- it's all free.
Couples seeking "a third" are actually very common, but for good reasons, there are few people who'd date an established couple.Oh, yes, the "V" -- I used to go to Bisexual groups, and it seemed like everyone was "serially monogamous" just with one gender or the other. The very rare cases in which all three were together, it seemed to be usually a man plus two women, or if two men and a woman it was the V arrangement again. It seems that persons who actually want to be romantically involved with both men and woman at the same time are very rare, so I hope some people will discover our new site. I had the idea that if our site makes it easier for persons to find each other, it might encourage more people to try a complex relationship -- a Triangle or larger group.