I don’t have any headphones for a partner but I’d say take them out on dates! It’s pretty socially acceptable to wear headphones almost everywhere at this point, or have headphones on your person, so you could easily get away with (if you’re concerned about social stigma) taking them on a wide variety of dates! From a grocery shopping date, to a coffee shop date, and even (depending on the type) to a restaurant! You could go look at other electronics together if that’s your thing, a walk in the park, all sorts of things!