Woman having intercourse if she does tayammum after her menstrual bleeding stops
Question

                What is the ruling on a woman having intercourse at the time her menstrual bleeding stops, and she does not do ghusl, but her husband orders her to do tayammum?.
Praise be to Allah.
      What is required is to do ghusl if water is available and 
      one is able to do that, because Allah says (interpretation of the 
      meaning):

    “And when they have purified themselves, then go in unto 
    them as Allaah has ordained for you”

    [al-Baqarah 2:222]. 

    So she has to purify herself with water after her menses or 
    after postpartum bleeding stops, then he may come to her. But if they are on 
    a journey or she is sick and cannot use water, or water is not available, 
    then tayammum takes the place of ghusl because it is a means of 
    purification. 

    End quote. 

    Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him)