Introduction

First, I'm a single male, not what you are looking for.
What mayhem said, but also, online is a terrible way to meet people.
I had one meeting in 3 years. God only knows how many thousands of people I contacted.
First time I went to a swing a club a woman half my age approached me and ask to play while her husband watched us.
Now I go to a local party. Played the first time I went.
Odds of finding someone in person are way, way higher than online.
Others on here have said they thing it is because it is so easy to reject people, they reject everyone. They find a flaw.
Have you tried going to the events section on here to look for events in your area? Or groups for groups in your area?
Another thing that worked for me was , it was suggested that I try Fetlife because there aren't any swing clubs, meet and greets, socials or parties in my area. Fetlife is where I found a BDSM,kink and swing party.
So, try fetlife.

Most times these days, I do a lot more responding to others than I do initiating contact. You are correct in that people will get back to you if they are interested.

If a couple takes the time to reach out to me, I always respond back. I'll first read their profile before I do. Actually just did that today. The profile seemed to be looking for the type of play where "The girls get started and the men join in". That is not our style and I let them know that in as nice a way possible, but this doesn't answer the topic question.

The point is, when reaching out, I like to do my due diligence and make sure that we at least sound compatible on paper. An indication of a certain play style like the one mentioned above is an example of where I simply would not reach out.

When I do reach out, I usually try to comment on something I read in their profile and I try to remember to open up pictures when I do send something out. I don't really feel like I need to do much of an intro as most of that stuff is already in our profile. Personally, one or two sentences that show someone read my profile are worth more to me than paragraphs of more or less generic info.

If possible, I try to add some sort of value proposition. To tie all this together, as an example, if I see someone is interested in golf, I have free access for us and guests to a 9-hole course. I may mention that and see if they'd like to join us. If someone comes off as foodies, I may ask if they're interested in coming over our house for dinner/drinks.

Regardless of if we wind up moving things to a bedroom, the couple is already getting something for their time/effort. The more it seems like they have more to gain than lose by meeting us, the more likely they are to respond and actually meet.

What do most people put as an opening line to contact, and inquire as to whether a couple may be interested ?
I tend to say where we are from, that we are interested in "your" profile and would you like to meet for a drink or a meal? We tend to keep the message short and, copy and paste. I know that if we post an individually typed message, we might get more interest. NOT.... that did not work. We feel if people are interested they will inquire, and check us out. We have literally contacted hundreds of couples with no response, and we hear the same thing from many couples. Any suggestions or comments ???