OK, I don’t usually share this on here, but your thread has struck a chord with me, so….
My male partner and I (female) are both bi and we are also swingers. We have sex with others of both sexes - sometimes single men or women, sometimes couples, but always together as a couple ourselves - we never meet people separately. This gives us the opportunity to fulfil all aspects of our sexual desires with like-minded others, still staying within the context of our loving, trusting relationship with each other. It also gives the opportunity for flirtation, thrill of the chase etc - all those other things that some people (not everybody by any means) might feel they are missing out on when in a settled relationship, and possibly can lead to limerence, or be one of the causes of it anyway.
We don’t have “relationships” as such with the people we sleep with tho - some have become good friends, but it isn’t a dating type situation, for us. Others we know see it differently and are looking for longer term relationships with their playmates which include an emotional aspect.
Basically there are countless iterations of this - have met all kinds of couples who have different ways of organising their romantic and sexual lives. It’s all about finding something that works for both of you, or course. And then keeping the communication going, constantly checking in that it is STILL working. And stopping as soon as it isn’t.
I realise that for lots of people this type of set up absolutely would not be an option. However, it works perfectly for us. I think for SOME bisexual people, in particular, total monogamy can be something of a struggle. Not meaning to sound in ANY WAY biphobic there - after all I am bi myself - and I know plenty of bi people are happily and successfully monogamous, so am not meaning to generalise and please forgive any possible offence caused…..