Why wouldn't they?
It's an odd question, as if only married people would logically be poly. I would think it's more natural for single people to be poly and less natural for married folk, in a society that is predominantly monogamous, since all it means is having more than one relationship. Is it because you're married that you wonder why? The question doesn't make sense to me, but...
My answer: single polyfolk don't feel the need to limit themselves when it comes to loving relationships, just like anyone else who feels the same way. What's marital status got to do with it, anyway?
Perhaps on a board like this one, or in poly get-togethers, it seems that way, but what a small cross-section of society these represent! I would not assume that what gets posted here is "the usual" about people in general - it's just what's usual about people who choose to post about their lives on internet forums focused on polyamory.However, it appears to be more usual for people to go through the usual monogamous dating/engaged/married pattern-- and THEN discover that they're poly.
Chances of a person discovering they're poly BEFORE they are married/engaged/committed are rare.
It's much more common and acceptable for single people to want non-exclusivity in relationships and to date more than one person than it is for married people.
I do think that single poly are cheaters
I do think that single poly are cheaters
But non-excluvisity isn't necessarily poly, is it?
I do think that single poly are cheaters,but I do know quite a number of people at my job are not married ,or fifteen present are devorce and are living a misserable life,there are quiet a few of them that are still having affair,may be once a week with other coworkers,men on mem ,women on women and all other ways you may think about,but the third or single who is attached to a couple prefer to have their own apartment and still want their own freedom,I even ask a view of them why they will not be together and their reply is that they still need their freedom which they are accustom to .