Musical Rose, I'm not a big fan of the dating scene at all - what I find works well is getting to know folks more as friends in a social atmosphere. That is a low-pressure way of meeting folk. Sometimes you meet someone where there is a spark, and things can grow from there, but it feels much more natural to me.
Most areas of the country have some sort of poly group - you didn't indicate where you are from, or where your partner lives, but there are many resources out there.
Please check out The Birdcage - an open, friendly Polyamory forum for all parts of New York State
"Listen, or your tongue will make you deaf." - Native American Proverb