This is quite a personal subject for me so i won't go into detail but from what i know, it rarely works out and is usually better achieved with the same kind of love shared equally between each person. I don't know your sexuality so won't make any assumptions there but irrespective of that; if you intend to try and get involved with a married couple i would be upfront in asking about their expectations. Is this a novelty for them? Or is this something they've been seeking for quite some time? Are they experienced but just haven't found the right person? Is this something they only want on a more short term basis? Will you live with them? etc. etc. I suppose there's a juxtaposition in expecting people who engage in polyamory to remain exclusive past a certain point, but surely there has to be some security, some familiarity - otherwise it's arguably not a relationship at all. I hope you find what you're seeking and don't let anyone make you feel as though you're depraved. To quote Tolstoy; 'There are as many loves as there are hearts.' Good luck to you.