Definition:Contact of mouth of partner with the genitals of the other is known as oral sex. Stimulation of male genitals by tongue, lips and mouth is known as Fellatio, and oral stimulation of female genitals is called Cunnilingus.                                                                                                           

Either form of oral-genital sex can be done with one partner stimulating the other individually. Stimulation is known as “69”. Fellatio and Cunnilingus are used to induce or heighten the sexual arousal. Vatsyayan has labeled oral-genital sex as “Auparishtak” and mentioned 8 different ways of performing it.                                                                                                                                                                                 

The glans and frenulum are particularly sensitive to oral stimulation. Many women are highly aroused by licking or sucking of clitoris during cunnilingus.  There is no health risk in swallowing semen accidentally.                                                                                                                   

Oral-genital sex is quite common and many see it as normal and pleasurable part of lovemaking.  From scientific viewpoint, it is no less hygienic than mouth to mouth kissing, provided the parts are kept clean. It does not give rise to any disease.                                                                  

It should not be performed during pregnancy as it can cause air embolism resulting in sudden death. Persons with STD or HIV should avoid it.