calendar-bonded

To be calendar-bonded is to be close enough to feel comfortable sharing personal calendars with one another. This typically occurs in romantic relationships, biological families, best-friendships, and other interpersonal relationships wherein planning and logistics are important. In terms of romantic relationships, polyamorous people have a strong tendency to be calendar-bonded earlier in the relationship than monogamous people simply due to logistics.

(This term was coined by Telind Bench of the bay area in California, in conjunction with one of his romantic partners.)

"Hey, lover! Would you like to share Google Calendars?"
"Oh, uh...Sorry sweetie, I'm just not ready to be calendar-bonded yet. We can talk about it though. How important is it to you?"