Sex was the action by which two (or sometimes more) individuals engaged in what was frequently regarded culturally as "intimate contact". Often, this was the means by which they procreated their species. Sex was distinct from sexuality, the expression of sex and sexual desire.
However, as sex was generally associated with positive emotional and physical responses — except when one or more parties did not consent to it, as during rape — sex could also be practised for recreational, and not strictly procreational, ends. Sexual stimulation without a partner was masturbation.
Indeed, sex could be practised between two or more individuals of the same sex, which rarely had any procreative implications at all. Precise definition on what specific actions constituted sex varied by species and culture. By the 21st century, humans did not need to have sex to reproduce — the males donated sperm and it was injected into the females by syringe. (TV: Out of Time) Carys Fletcher worked as a temporary secretary at such a clinic. (TV: Day One)
Virginity was the state of not ever having had sex.
Whilst stuck in deep space in the 1980s Jason Kane had sex with several aliens, he eventually turned these experiences into several works of xenopornography, including Nights of the Perfumed Tentacle. (PROSE: Death and Diplomacy, Beige Planet Mars) River Song implied that she had sex with an Auton once, telling the Eleventh Doctor, Amy Pond, and an auton Rory Williams that she once dated a Nestene duplicate with swappable heads. She said that it kept "things fresh." (TV: The Big Bang)
Several species have disguised themselves as human and then engaged in sex with other humans whilst disguised such as the Zygon Kritakh who had sex with Lauren Anderson, the Arcateen Mary with Toshiko Sato, and a member of the Slitheen family disguised as Oliver Charles who, around early 2006, enjoyed a number of sexual encounters with Oliver's wife, mistress and a young farmer. (HOMEVID: Zygon: When Being You Just Isn't Enough, TV: Greeks Bearing Gifts, Aliens of London)
Time Lords Edit
By most accounts, Time Lords were implied capable of sexual procreation. The Master, for instance, claimed to have a father, (TV: The End of Time) as did the Doctor. (TV: Doctor Who, The Fires of Pompeii)
In several accounts, the Doctor explicitly referred to himself as having been a father himself prior to his tenth incarnation, (TV: Fear Her, The Doctor's Daughter, Listen) and was identified as the grandfather of Susan Foreman by Susan, (TV: "An Unearthly Child", "The Escape") Barbara Wright, (TV: "An Unearthly Child", "Hidden Danger") Ian Chesterton, (TV: "The Ambush", "Kidnap") Ping-Cho (TV: "The Wall of Lies") and the First Doctor. (TV: "The Brink of Disaster") Clara Oswald also referred to the Doctor's missing "children and grandchildren", (TV: Death in Heaven) while the First Doctor (TV: "The Rescue", Marco Polo, The Sensorites, "Flashpoint") and the First Elder (TV: "Hidden Danger") mentioned Susan as the Doctor's grandchild. In his eleventh incarnation, the Doctor recalled coming to the Rings of Akhaten "a long time ago with my granddaughter". (TV: The Rings of Akhaten)
Susan, too, had at least one child — whom she identified as the Doctor's great-grandson — by the human David Campbell. (AUDIO: An Earthly Child, et al) The Tenth Doctor also described the possibility of genetically collateral relationships when he told Martha Jones he didn't have a brother "any more". (TV: Smith and Jones)
900 years old, me. I've been around a bit. I think you can assume at some point I've "danced".
However, another account suggested that sex had ceased to have a reproductive function on Gallifrey long before the Doctor's time. According to this school of thought, the "Pythia's Curse" had made Gallifreyans effectively sterile. Reproduction was carried out by the carefully controlled use of Looms, which produced new Time Lords as fully-formed adults. No direct genetic relationships were therefore possible. Time Lords arising from the same House — for each House had only one Loom — were considered "cousins". (PROSE: Lungbarrow)
The Doctor Edit
Though rare, there were occasional hints that the Doctor did indeed have sex. Benny Summerfield and the Doctor might have had sex soon after he regenerated into his eighth body. (PROSE: The Dying Days) Summerfield seemed to confirm the incident when they met again at a later date. (AUDIO: Benny's Story)
"Dancing" was a euphemism for sex used by the Ninth Doctor and Rose Tyler. The Doctor said he had "danced" before and raised the question of who Jack would like to "dance" with: himself or Rose. (TV: The Doctor Dances)
The Tenth Doctor apparently had something of an eye for royal women, as he later had a brief marriage with Elizabeth I. After promising to be "right back" but fleeing her, (TV: The Day of the Doctor) he stopped just short of telling Ood Sigma that her nickname, "the Virgin Queen", was no longer accurate. (TV: The End of Time) Just after accidentally proposing to her, the Doctor quipped, "The Virgin Queen? So much for history." (TV: The Day of the Doctor) The Doctor's sexual involvement with Elizabeth I was later hinted at by future Queen Liz 10 (TV: The Beast Below) and by the Dream Lord. (TV: Amy's Choice)
Amy Pond, following a near-death experience with the Weeping Angels, attempted to seduce the Doctor's eleventh incarnation. Though he refused, he implied in answer to her question that he hadn't had sex in "a while". (TV: Flesh and Stone)
River Song intimated on several occasions that she and the Eleventh Doctor had (or will have, from his perspective) a sexual relationship. (TV: The Impossible Astronaut, A Good Man Goes to War) Their eventual marriage seemed to support this as well; the Doctor claimed to Dorium Maldovar that River's nights spent in prison were between her and himself. (TV: The Wedding of River Song)
Sex and psychology Edit
Chris Cwej, after meeting with the Daleks, had sex with Christine Summerfield, just to feel something human again. (PROSE: Dead Romance) Similarly Gwen Cooper had sex with Owen Harper following a disturbing encounter with cannibals and Torchwood. (TV: Countrycide)
Khiste had sex with Christine Summerfield to prove a point about manipulation. (PROSE: Dead Romance) Whilst Adam Smith manipulated Toshiko Sato's personality to make her bolder and more assertive and then had sex with. (TV: Adam)
Inter-species procreation Edit
In India in 1886, Clemency Eddison fell in love with a Vespiform who had taken the form of a human. She had sex with him and fell pregnant; the resulting child was Arnold Golightly. (TV: The Unicorn and the Wasp)
Chris Cwej had sex with Ishtar Hutchings whilst on Earth in 2010; following this encounter, she became pregnant, eventually giving birth to Jasmine Surprise Cwej-Hutchings. Jasmine went on to have sex with Ricky McIlveen, they produced a child, an Eternal: Time. (PROSE: Happy Endings, Warchild)
Eve, whose species were killed during the Last Great Time War, fell in love with a human named Samuel Lloyd, and they flew away together in her Ship. Their son, Adam, looked human but had the power to manipulate timelines like his mother's race. In 2059, he appeared to Rani Chandra as a teenager and restored her timeline. (TV: The Mad Woman in the Attic)
Other contexts Edit
The term "sexy" was used by an individual to describe another who they thought was sexually attractive. In his eleventh incarnation, the Doctor called his TARDIS sexy. (TV: The Doctor's Wife) The Doctor referred to the Saturnyns as "sexy fish vampires". (TV: A Good Man Goes to War) When Plark told his subordinate to make their simulation of Joseph Serf smile at Sarah Jane Smith, the Skullion made him give a "sexy smile", only to be told by Plark to give him a "thoughtful smile, not sexy smile". (TV: The Man Who Never Was)