Well it seems that for the most part, Couples seem to look at the same things they would whether they were in the lifestyle or not. If you were single and talking to someone to see if they were boyfriend/girlfriend material, many of the same actions apply.
It would appear that most begin thru e-mail correspondance, after a period of time decide to meet in a public place, if interest is still there, get a phone number and then set up a time to meet and play (if it gets that far). While this isn't indicative of every scenario, I'm sure that for the vast majority this is a good standard for which to go by. Thanks for the input.