I am going to go against the flow here and say that after a meeting of dinner and drinks you should probably expect something within three days time. I am usually in the crowd who says that people get busy - but a meet is a whole other animal. I think we all expect for them to go thusly:
1. Meet
2. Leave as a couple and discuss your impressions
3. Email rather quickly, either excitedly or with a "sorry, but we aren't right" message
I know for us, as soon as we leave a restaurant, we are discussing the "next step" - and as a courtesy we write a quick email the minute we get home. Maybe we are weird, but we think a couple needs to know that we either are or are not into them.
Granted - if you write us typically we can take forever to get back to you. But a meet for drinks and/or dinner isn't "typical". In "swing-dom" that is basically a gauge of sexual chemistry. Of course you are going to expect (and rightly so) some sort of feed back.
Three days is a little on the long side...
But - as the others have said - there are other fish in the sea. And, who knows, this could just be a socially backwards couple who just don't realize that maybe they have some responsibility to respond. You could hear from them in a week - or a month... I'd just move on and let things either happen with them - or not.
But - seriously - don't let this experience ruin your future experiences! There are good ones out there!
We all get rejected - and no one is everyone's cup of tea.
I am very sorry this has you down. One of the great things about swinging (that I've observed) is actually how good about themselves it makes most women feel. You deserve to feel that way! So hang in there until you do!
Spoomonkey