We used to have no problem sending "No Thanks" type responses and then a couple of things happened. We got our first "no thanks" email back to us. It kinda stung to be honest...though better than no response at all. We also made a couple of trips to Desire where our interest in playing with another couple really changed after we got a chance to know them and we're swayed much more by their personality than looks or by the fact that they didn't seem our "type" based on first impressions. After that we do try and frame our responses as nice as can be. Now there are couples where there is just simply no chance. But for a a majority of couples, we like to take a never say never approach. So we may frame responses along the lines of, 'no thanks' but that if we cross paths at one of our local clubs and wouldn't mind saying hi. We realize that this is a fine line and some couples may take that as an opening to keep pushing it. That is a red flag for us and we'll tend to shut things down a bit more clearly. It can be complicated...lol!