My wife got repeated infections and had a lot of pain from the copper iud.
If you go looking for testimonials you’ll find numerous people who had bad experiences with it.
Also, they really should offer anesthetic or at least a powerful painkiller for the insertion and removal procedures. Doctors act like it’s no big deal, but it’s very painful.
The majority of people occupying the same bed will have congruent driver/passenger sides. Distant strangers don’t need to know which side you are referring to. Couples from different regions could adopt the local convention.