This can be done lying down, one on top of the other or side by side. Alternatively, one partner can stand while holding the other upside down. In this position, the genitals are approached from the opposite direction, allegedly creating a sensation different from that of ordinary oral sex.
In an act of 69 that includes a female partner, her clitoris is licked, possibly through the clitoral hood, which provides a buffer if the clitoris is too sensitive for direct stimulation.
If a male partner is present, his frenulum rubs against the roof of the performing partner's mouth, while the foreskin and the front of the glans may be stimulated by their tongue.
In an act of 69 between a male and a female partner, the female may choose to be on top so that she can control how deep the penis enters her (deep throating) to avoid gagging.
One variation on 69 includes digital penetration of either partner's anus or vagina.
The position carries the benefit of allowing partners to experience sexual stimulation simultaneously, but this can also distract those who try to focus solely on pleasuring themselves. The position can also be awkward for partners who are not similar in height
