Charak Samhita
नृद्वेषिण्यस्तनी चैव षण्ढी स्यादनुपक्रमा । विषमं दुःखशय्यायां मैथुनात् कुपितोऽनिलः ॥३५॥
The woman dislikes the males and is having underdeveloped breasts. This is incurable and is known as shandhi. ॥ Mahayoni yonivyapat॥ If coitus is performed with difficulty on an uncomfortable bed, the vitiated vata dilates the orifices of uterus and vagina.
english translation
nRdveSiNyastanI caiva SaNDhI syAdanupakramA । viSamaM duHkhazayyAyAM maithunAt kupito'nilaH ॥35॥
hk transliteration by Sanscript