Facesitting, also known as queening or kinging, is a sexual practice in which one partner sits on or over the other's face, typically to allow or force oral–genital or oral–anal contact. In addition to oral-genital and oral-anal contact, the position also leaves the bottom partner's hands free to stimulate other erogenous zones (e.g., anus, nipples, etc.). The top partner may be facing either direction in this position. It is common for this position to form part of BDSM, involving dominance and submission, though this need not be the case. Within a BDSM or D/s context, facesitting can be a form of erotic humiliation.
Facesitting is common among dominant and submissive individuals, for demonstrating superiority and for sexual gratification. Unlike smothering, in facesitting the bottom partner is not deprived of air. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person.
Sometimes special furniture is used, such as a "queening stool" or "smotherbox". A queening stool is a low seat which fits over the submissive's face and contains an opening to allow oral-genital and/or oral-anal stimulation of the domme while seated.
The position allows the pelvic floor muscles (PFM) to relax and therefore partly exposing the labia minora to intimate touch. The gluteus maximus and levator ani muscles, the major muscles of the crotch, can relax and sag allowing easy access to the vagina and anus. Additionally, the stool allows for greater comfort and allows for the activity to be done for a longer period of time. 
A smotherbox (or "smothering box") is a special form of queening stool which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks. A smotherbox has two openings. One is in a vertical side of the box for the neck of the person who has their head inside the smotherbox. The other is in the top of the box to expose their face. The inside of a smotherbox is often padded to provide support for their neck and prevent their head from moving. The padding may also muffle noises from the outside, causing a relaxation effect and heightening their other senses. Smotherboxes are usually custom made pieces of furniture that may have a special significance for their users. They are often made out of precious woods, with leather used for the seat.
The smotherbox is placed on a stable surface. The cover (top half of the smotherbox) is open while the submissive lies down on their back and places their head in the box. When they are in position the cover is closed. The cover can have hinges or be a separate part. Locks may be used to emphasize the submissive position or the submissive's hands may be fastened above their head to the box. Smotherboxes may be more permanently mounted to tables or other stable objects, and the submissive restrained to that surface instead. A Queening Chair or Facesitting Throne is another variation that is popular, designed to emphasize the relative place of the domme and submissive. They can be elegant and more formal than the smotherbox.
In popular culture of the United Kingdom
In 1980, Monty Python recorded a humorous song, "Sit on My Face", about the pleasures of facesitting. Written by Eric Idle, the song's lyrics are sung to the melody of "Sing As We Go" by Gracie Fields. The opening gives way to multiple male voices singing "Sit on my face and tell me that you love me." The remaining lyrics contain numerous references to fellatio and cunnilingus, such as "when I'm between your thighs you blow me away" and "life can be fine if we both 69".
In 2014, the British government announced a ban on the production of hardcore pornography for the Internet. Ostensibly, the bill sought to protect women from sex acts that were violent or unsafe, and banned a wide variety of sex practices, including facesitting, strangulation and fisting.  This law only impacts the production of pornographic videos as opposed to acts performed privately. Protests against the law were held outside the Palace of Westminster, with protesters saying the law does not reflect the wishes of the public.
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- Media related to Face sitting at Wikimedia Commons