I’ve never minded showering together with anyone. Tho it is nicer if you have a nice big rain showerhead so you can both enjoy the warm water.

But I definitely wouldn’t say me showering with someone else ever saved any water, it would either just take almost twice as long as me taking the shower alone or we would end up having sex making the shower take longer than us just having two separate showers

There’s a high chance that that receipt paper is heat activated, so I’d wager it’s none

Were you trying to speedrun a diagnosis or did you do that unintentionally?