For us swinging is a couple activity, that is us as a couple. It is sharing the fun, the excitement, and the anticipation together. And then talking non-stop like teenagers about it for days to come.
My beautiful bride has given me the okay to play solo in the past when I was out of town and met a girl that just did it for me. But in the end it didn't happen. As it turns out she only lives several hours away so we tried to arrange a threesome, but she flaked.

Oh, well. I think she had different ideas of the relationship, which just seems like it would be a problem if the other person wasn't in the lifestyle, or had a clear definition between love and sex.
We know couples that do play solo, and it works for them. But it just isn't our gig at this time. Someday our play may morph into solo play, but I don't see it happening at this time.
Mr. WS