Be careful if you use a loyalty card your SO has set up.
I stopped in CVS yesterday to pick up a few bottles of a lube I like to keep on hand for appointments. As I was checking out they asked if I had a loyalty card. My SO does and the cashier looked up the number using our home phone.
When I got home a few hours later, my SO said "interesting purchases" and then showed me an emailed receipt listing everything I had purchased.
If I had purchased condoms it would have been pretty ugly.
Don't know what other stores might have the same set up.
Be careful.