Kama Sutra
The Ancient Indian "Kama Sutra", dating from the first century AD, describes oral sex, discussing fellatio in great detail (the "Kama Sutra" has a chapter on (or ), "mouth congress") and only briefly mentioning cunnilingus. However, according to the "Kama Sutra", fellatio is above all a characteristic of eunuchs (or, according to other translations, of effeminate homosexuals or trans women similar to the modern Hijra of India), who use their mouths as a substitute for female genitalia.