whoa - too scary for me!!! i have a hard enough time handling one relationship - and have not done that great a job at that for years. mixing it up with more than one just sounds like trouble to me. the casual sex sort of thing reminds me too much of abuse. almost inevitable that emotions will get involved sooner or later on somebody's part. and then - lots of hurts...
seems like you might be better off getting yourself strong and healthy and stable first before making any huge changes like that.
"That you are here - that life exists, and identity; that the powerful play goes on and you may contribute a verse. . . What will your verse be?" Robin Williams as John Keating in "Dead Poets Society"