It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) in marfu' form (attributed to the Prophet) that the Prophet (peace and blessings be upon him) said: "Soon you will prevail over the non-Arabs, and you will build houses which will be called hammams (bathhouses). A man should not enter them without a waist-wrapper, and women should not enter them except one in postnatal bleeding or because of some illness."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13656