Bicurious and Looking

So I've always been bicurious and my boyfriend has always known this since before we even started dating. We've been together for almost a year now and because he's been so supportive of my curiosities we've been trying to find another girl to join but every girl I talk to likes me up until the part I tell them about what I'm looking for (not just looking for sex either). Am I going about this the wrong way? I've been using Tinder and Her to find potential women.