Kamasutra 2.8.41

2.8.41

na tv evartau na prasūtāṃ na mṛgīṃ na ca garbhiṇīm
na cātivyāyatāṃ nārīṃ yojayet puruṣāyite//

"Though a woman is reserved, and keeps her feelings concealed, yet when she gets on the top of a man, she then shows all her love and desire. A man should gather from the actions of the woman of what disposition she is, and in what way she likes to be enjoyed. A woman during her monthly courses, a woman who has been lately confined, and a fat woman should not be made to act the part of a man."