Protection when playing with others?

Regarding condoms and others:

Using protection/condoms has been quite an issue In my cuckold dynamic through the years. I am now in my third cuckold-relationship with my actual girlfriend. Condoms have a part of the practical and safety aspect but also a considerable power and symbolic aspect in my opinion. With my first girlfriend because of whom I became a cuckold condoms were one of the key aspects in that dynamic. We were not using condoms but after the first time she cheated on me and that I suspected that she was going to continue to cheat om me I thought it was a good idea to use reverse psychology so I bought especially a pack of condoms for her to use wit her lover thinking that this would help make her stop cheating on me. To what I could notice up to the stains in her panties when I checked them in the laundry-bin she was not using condoms with her lover... The fact that she would use condoms with her lover and have bare sex with me gave me the idea I would be still the number one for her. I got quite obsessed to always have sex with her when she came in late and that I suspected she had been being her lover. Mostly she did not let me have sex with her but the several times we did I smelled semen that was not mine and noticed that she was much more wet and slippery inside the usual. So she was not using condoms with her lover at all. She then stopped being her lover and our relationship then became even better then before.

One year later she wanted to get off birth control for her health and we then started to use condoms what we never had done before. I also regularly started to loose my erections when putting on a condom. It evolved that she started to talk about me having a vasectomy. She in fact started with this idea that it would make everything easier for both of us. I was not so wild for the idea but I thought that if she would not use contraception she maybe would be more faithful to me next to the convenience not to use condoms anymore and me getting of my occasional ED . So I indeed had a vasectomy and everything went very well for a good year.

Then she started to get annoyed (up to her) because of my sperm leaking out of her when we had sex together and changing the sheets of the bed etc. and wanted that we use condoms again. So in fact I got a snipped for nothing and had quite some difficulties keeping my erection and started also to use viagra to help for this problem. Sex between us became less and less, also reproaching me that the sex was not so good anymore between us. At that time sex between us was me licking her to orgasm and she masturbating me in ... a condom... It ended that she bought me a fleshlight fo my anniversary for me to cum in while I was licking her to orgasm and using her favorite dildo on her to make her cum. Some time later I suspected her to have again a lover and found out that she was taking the pill again. So I got snipped for nothing and was made to cum only in plastic and silicone while she was having herself filled up with the sperm of her lover..