Not just couples. I was aghast to learn that my fellow parents at work track the location of their teenage kids. All of them, except me. What the fuck? If I want to know where they are I text and ask.
What's more - half of them also have it turned on in the other direction.
This is crazy to me. I want my kids to grow into adults and I'm not going to surveil them all the time. I think a kid of teen age has some reasonable expectation of privacy. We are close, I have a good relationship with my kids but not THAT close, I don't need to know if you stopped at Wawa on your way home.