My husband starting getting me interested about 1 year before we actually started swinging and he didn't even know he was doing it! He did know I was bi-curious, however, when he married me.
After about a year of my husband telling me "naughty" stories of us and our best friends (who btw, we have never swung with and probably never will bring it up!) while we made love, I asked him if he wanted to give it a try! LOL He assured me that his intent in telling me stories was not to get me to swing and that he was fine if we didn't!
As you can see, the lack of presure and the loving support he gave were key in getting me interested in trying!
This was 2 years ago and we really have a blast with it now!
Good luck to you and remember...NO PRESSURE!
