I tend to assume that my gf discusses some, maybe even most, of what happens within our relationship with her husband. After all, I discuss the relationship with my very close friends (I like to gush and/or ask for advice)! But if I do ever *ask* for privacy -- if I say something like "I'm really embarrassed about this desire, but..." or "I've never told anyone this, but..." -- it damn well better stay between the two of us!! I would expect that of any friend, and that extends to romantic partners.
What sorts of secrets are you envisioning there potentially being?
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.