[S]oul-deep vulnerability” ... leads people to recognize how and why their selves are whole selves, the sort that can’t really be divided up amongst different degrees and kinds of lovers and sex partners without incurring a certain kind of damage.Of course it's true that polyamorous relationships could function as "orgies for prudes, sexual freedom for people who are afraid of the actual, bone-deep vulnerability and immediacy of sex." But it's by no means clear that they necessarily must be so.
Whenever social conservatives start blathering about how our souls or whatever need to be protected from some sort of "damage," I reach for my metaphorical gun.