As for God bless the internet, how bloody true.
We started swinging- swapping way back in the mid 70’s when we were 35 after being married 15 years, I took the wife's cherry when she was 19.
To met people you had to put an ad in a local (which was Australia wide) sex contact paper or reply to someone else's ad, “we did it both ways”, if you seen and ad you liked you had to send a reply with your contact phone number (no mobile phones back in those days) to the sex paper and (for a fee) they would pass it along to the people you were replying to, then it was up to them to ring you and for you to arrange a meeting from there, very time consuming and not very reliable I can tell you.
We were in the scene for 25 + years and at the finish of our swinging career “we were actually more so into M F M threesomes by this time” the internet was just coming into vogue and their were chat rooms (no cams at the time) where you could meet up with a guy, like the way a conversation was going, get his phone number and you could meet pretty well straight away, strike while the iron was hot as the saying goes.
Married 46 years now and retired from swinging-swapping and M F M threesomes and also work, enjoying ourselves traveling around and we are still very much in love.