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. 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. Sex was distinct from sexuality, the expression of sex and sexual desire.
Indeed, sex could be practised between two or more individuals of the same gender, 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)
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) Likewise, Susan said she was the grand-daughter of the Doctor (TV: An Unearthly Child, et al) and she 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 Ninth Doctor once seemed distinctly perturbed when Rose Tyler implied he didn't "dance" — a metaphor for sex that had arisen between the two. (TV: The Doctor Dances) 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) He also said that — long before his daughter was created asexually (TV: The Doctor's Daughter) — he had been a father. (TV: Fear Her) Indeed the presence of obvious sexual attraction between the Meta-Crisis Tenth Doctor and Rose Tyler suggested that natural, biological reproduction — or at the very least recreational sex — was possible.
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)
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
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)
According to Rhys Williams, several power cuts in the 1970s resulted in baby booms, as people "took advantage of the dark". (TV: The Gathering) In 1988, Augustus and Tabetha conceived Amelia Pond. [source needed]Amy Pond and Rory Williams had sex on board the TARDIS on their wedding night, resulting in the conception of Melody Pond. (TV: A Good Man Goes to War)
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 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)
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Whilst travelling with the Seventh Doctor, Ace had sex with several people including; Kedin Ashar on Mendeb Three and Jan on Heaven. (PROSE: Independence Day, Love and War) Following her departure from travelling with the Doctor and her return having spent time in the Spacefleet, she continued with individuals such as; Bill Cook, first mate of the Arrow, (PROSE: Legacy), Tom Dekker whilst in Chicago, 1929. (PROSE: Blood Harvest) a clone of Jason Kane just prior to Bernice Summerfield's wedding. (PROSE: Happy Endings) Additionally after getting to know (a clone of) Abslom Daak, Ace considered having sex with him. (PROSE: Deceit)
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, but presumably wasn't actually sexually attracted to it. (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)