[lbarrett]

I also let my spouse unlock my phone. It's not so much "being an open book" as it is "I trust her not to snoop, and sometimes it's convenient that she can open a map on my phone." That meets your definition of trust: not having to know what she does because I know she'll do the right thing.

[justsid]

Very fair point. In fact, my wife actually knows my phones passcode for the exact same reason. „Open book“ was definitely the wrong phrasing here, I wasn‘t trying to say that you have to keep everything secret from your spouse. Just that the exact opposite of that also strikes me as very distrusting.