I never called this a “rule”.
I thought it was just common sense and respect for your partner.
Unfortunately some of my former partners didn’t think the same.
I never called this a rule.
Agreement, rule, understanding, meeting of the minds.
Quaint? Or modern? Back in the day, when I went to an Ob-Gyn doctor, it was just the doctor and me in the exam room. In the mid- to late '70s, there would be a nurse standing in the room doing nothing - just there for insurance purposes to thwart false sexual abuse/harrassment claims.
I admire the Pence's commitment to their marriage, and also think it's wise in these days of "gotcha" journalism.