Cool, thanks.No idea of the layout of your boat, but it sounds like you are sharing a stateroom with en suite toilet? or is it down the passageway? I've only been out on dormitory style boats and the head was waaaay down the passage for all. Everyone male or female, pulls on something to go, if they don't wear anything to bed (uncommon on my trips, cooler climes). Changing can be done in the bunks equipped with privacy curtains, for the eyes of god and everyone in the narrow passage next to the bunks, or the tiny changing room (or I suppose, the aforementioned head). Seems to work fine whatever the mix of male & female. I've not seen or heard of any problems over many years on the boats.
I'm in a 4 bunk room with an ensuite. It has air con, so it should be perfect at night.
I'm not actually planning on sleeping nude....