The Messenger of Allah (ﷺ) forbade to enter the hot baths. He then permitted men to enter them in lower garments.

AbulMalih said: Some women of Syria came to Aisha. She asked them: From whom are you? They replied: From the people of Syria. She said: Perhaps you belong to the place where women enter hot baths (for washing ). The said: Yes. She said: I heard the Messenger of Allah (ﷺ) say: If a woman puts off her clothes in a place other than her house, she tears the veil between her and Allah, the Exalted.

Abu Dawud said: This is the tradition narrated by Jarir, and it is more perfect. Jarir did not mention Abu al-Malih. He said (on the authority of 'A'ishah) that the Messenger of Allah (ﷺ) said.

The Prophet (ﷺ) said: After some time the lands of the non-Arabs will be conquered for you, and there you will find houses called hammamat (hot baths). so men should not enter them (to wash) except in lower garments, and forbid the women to enter them except a sick or one who is in a child-bed.

The Messenger of Allah (ﷺ) saw a man washing in a public place without a lower garment. So he mounted the pulpit, praised and extolled Allah and said: Allah is characterised by modesty and concealment. So when any of you washes, he should conceal himself.

The former is more perfect.

The Messenger of Allah (ﷺ) sat with us and my thigh was uncovered. He said: Do you not know that thigh is a private part ?

The Prophet (ﷺ) said: Do not uncover you thigh, and do not look at the thigh of the living and the dead.

Abu Dawud said: This tradition disagrees with the generally reported traditions (nakarah).

I lifted a heavy stone. While I was walking my garment fell down. The Messenger of Allah (ﷺ) said to me: Take you garment upon you, and do not walk naked.

I said: Messenger of Allah, from whom should we conceal our private parts and to whom can we show? He replied: conceal your private parts except from your wife and from whom your right hands possess (slave-girls).

I then asked: Messenger of Allah, (what should we do), if the people are assembled together?

He replied: If it is within your power that no one looks at it, then no one should look at it.

I then asked: Messenger of Allah if one of us is alone, (what should he do)?

He replied: Allah is more entitled than people that bashfulness should be shown to him.

The Prophet (ﷺ) said: A man should not look at the private parts of another man, and a woman should not look at the private parts of another woman. A man should not lie with another man without wearing lower garment under one cover; and a woman should not be lie with another woman without wearing lower garment under one cover.

The Prophet (ﷺ) said: A man should not lie with another man and a woman should not lie with another woman without covering their private parts except a child or a father. He also mentioned a third thing which I forgot.