I was widowed in 2014 after numerous years with my husband - who knew (and approved of) my hobby life. We were also active swingers, so this satisfied his desire for sex outside the marriage. I'll admit, however, that it felt like there was something missing. It took a long time for me to figure out what that was.  

I am now happily re-attached. Phenomenal guy - perhaps the love of my life. That said - I do NOT believe that the majority of human beings are naturally wired to be monogamous. He and I swing on occasion as well, and he even went so far as to mention the idea of polyamory. After a long discussion, we found that it's really not polyamory that he's after (because our definition of polyamory entails love for the other parties)....but rather, some side FWB relationships peppered with some house parties or whatever else we might decide on. It's actually made our relationship much stronger now that we spent time focused on discussing this topic. Questions/answers/concerns/fears, etc. All the good stuff, lol.  

Ultimately, he is my strongest emotional support post, and I seem to be his.  We are much more than 'companions' or even 'lovers' -- it's much deeper than that. But we each understand the sexual needs and desires of the other. His biggest turn on is watching me have sexual relations with other men (who would have thought??) and then playing with other singles/couples on occasion...but doing so as a couple.  

Everything's about respect and communication -- two very important factors that many relationships seem to be missing.  Our openness to help each other explore and fulfill our sexual needs has only served to make our relationship tighter.  My love life is very fulfilled.  It takes a lot to sit down and have these kind of discussions. But I believe that when you approach it out of love and respect, without judgement or criticism, and with an attitude of curiosity and perhaps even compromise -- then things can only get better.  

Long post...sorry for babbling. Best of luck in finding your happiness.