Is it true that men can't wash women's underwear?

The old man said: The moon in the sky disappeared and was eaten by a flying dog.

The old man said: I am not tall with an umbrella on a sunny day.

The old man said: Speak ill of others behind their backs, and pull out your tongue when you die.

I believe it with complete certainty.

There are many taboos that have been passed down from generation to generation and blurred the original reasons, but they have developed incredible statements. The original reason for not washing underwear is to let men not touch women's clothes to prevent women from getting infected during menstruation and so on.