swinging led to cuck lifestyle

My wife and i now both in late 50s started swinging in early 80s. We were married in 1979 i was 19 she was 18. I classed myself as a bit of a stud back then. Id fuck a girl then move onto next one. They all seemed to be queing up for it. Alison my wife loved to show off when we were dating. She always wore split skirts that showed of lot of thigh when she sat down or moved. I seemed to be constantly aroused when we were out. She loved it when guys hit on her andalways took drinks from them. It used to really aannooy me but if i sulked about it she wouldnt have sex when we got home. Sometimes she was so turned on she would get me to fuck her in doorway as we walked home.
Once we were married kids came along and things were bit stale . I worked shifts and often when i was on nights she would climb into my bed during day and try to get me to fuck her but i was too tired. At weekends i was so ready to fuck her because i was of but she didnt want to. This went on for a while and one day i was tidyinfg bedroom and i dont know why but i lifted mattress on her side of bed and was shocked to find a vibrator under there with some nipple clamps. When i confronted her she said she was horny and things had got to boring she loved having nipple clamps on and masturbating. To cut long story short we said about wifeswapping we had seen docmentry on tv and thought we give it a go.
I went out and bought a contact magazine with couples single guys single women etc in it was a good few years before internet. Call photos had black rectangle overctheir faces but we found one couple he was 41 she was 39 she was 14 years olden than me so i thought she be gagging for some younger cock