Latin:
You're not the first to suggest a "rating system" for single guys. I doubt that would happen or be accurate anyway. But, while we're far from experts, we have had some success with single guys and here's how we do it now. Some of this is based on Front Porch Swingers' advice and their podcast. It seems to work.
-Punch up one's profile to reflect what you want, including specifics about guy guest stars.
-Conduct a gentle but probing questioning of the guys who reach out to you.
--How much experience do you have with couples, hot wives, or groups?
--What are you seeking from the lifestyle?
--What are seeking by playing with us/her?
--What rules or guidelines do you have?
...and so on....
-Then a few key questions:
--Are you single? ..or...
--If the guy is claiming a hall pass: When can we chat with or meet your wife to make sure this is ok?
--Can you host us/her?
--Do you mind meeting us for a chat to see if we click?
--My husband chats with guys who want to date me, when can he meet or talk with you?
If a guy will answer most of these with some verification, then he's probably legit and will show up. We have enjoyed quickie fun, but we much prefer to build friendships with guys. For us, repeat performances seem to lead to great erotic fun and friendships. We've had good luck on sls in particular.
On logistics: We try to be explicit on times, places, and attire. We confirm and reconfirm the day of. But in the DC region traffic is truly the worst in the nation and people do get delayed often. We like to entertain on our boat, so we publish a "sailing time." Some guys miss this and that really perturbs us, since we could have been out on the water relaxing, rather than waiting at the dock. We write them off after they blow us off.
The good gentlemen on here will have some or lots of validations or endorsements. We've not really been disappointed in guys with endorsements. Hope this helps. This process has cut way down on the flakers, fakers, guys who don't know what RSVP means, and creepers.
-fnh