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

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)