Ruling on women going to women’s clubs
Question

                We live in the residential quarter of one of the cities, and in this quarter there is a women’s club which has a women-only swimming pool and a steam bath (sauna). What is the ruling on women going to this club, and what should their husbands do? We tried to advise some of our brother and they told us that the ‘awrah of a woman in front of another woman is from the navel to the knees, said that their women wear Islamic dress when going swimming – but this dress shows the shape of their ‘awrah. We hope that you can answer this question with shar’i evidence, may Allaah preserve you.
Praise be to Allah.My advice to my brothers is not to let their 
          women go to swimming clubs and sports clubs, because the Prophet  
          (peace and blessings of Allaah be upon him) urged women to stay in their 
          homes. When speaking about women going to the mosques, which are the 
          places of worship and shar’i knowledge, he said: “Do not prevent the 
          female slaves of Allaah from going to the mosques of Allaah, although 
          their homes are better for them.” This is also in accordance with the 
          words of Allaah (interpretation of the meaning): 
“And stay in your houses” [al-Ahzaab 33:33] 
 Moreover, if a woman gets used to that 
          she will form a strong attachment to it, because her emotions are so 
          strong. Then it will distract her from her religious and worldly duties, 
          and it will become all that she thinks and talks about. If a woman does 
          something like this, it will be a means of taking away her modesty, 
          and if a woman’s modesty is taken away from her, do not even ask about 
          the evil consequences that may follow, unless Allaah blesses her with 
          righteousness which will restore to her the modesty which is her birthright.  
            
I will conclude my answer by repeating my 
          advice to my believing brothers not to let their womenfolk – whether 
          they are their daughters, sisters, wives or anyone else under their 
          guardianship – go to these clubs. I ask Allaah to bless all of us with 
          strength and caution against the misleading ways of temptation, for 
          He is able to do all things. Praise be to Allaah, the Lord of the Worlds, 
          and blessings and peace be upon our Prophet Muhammad and all his family 
          and companions.