Mixing underwear

Personally for me, out of respect if you go to anyone’s house and need to do laundry, please have some spare. Don’t wash your undergarments at other people’s house. My SIL will bring home all her undergarments whenever she stays over at my parents place. It’s quite embarrassing having to air your undergarments at someone else’s house and you have unannounced guests coming over at times. If it was my own house, I’d just throw everything in the machine and hang it out into the sun to dry quickly. We were also taught not to allow ANYONE (helpers especially) to wash or touch our own family’s undergarments especially husband and wife’s afraid it might cause unnecessary tension in the marriage, and for that I wouldn’t take a risk. You never know these people might have ill intentions. Ahhh I wouldn’t dare.