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Torchwood is an adult spin off of the TV series Doctor Who, because of this the themes explored throughout most of the episodes are that of a more adult nature. The TV series mainly deals with LGBT (Lesbian, Gay, Bisexual and Transgender) themes assossiated with Homosexuality and Bisexuality with the characters involved and portrayed as sexually 'fluid'. The characters that portray these LGBT themes are that of Jack, Ianto and Toshiko, but their sexual preference and/or flexability are not discussed in any detail.
Aswell as sexual discussion/themes throughout the series, there is also discussion of the Value of Human Life, the corruption of natures power, existentialism and Redemption. It draws parallels between characters and the repition of importent lines thoughout the series.
 Homosexuality & Bisexuality
Torchwood mainly deals with the idea of Bisexuality. Each of the Torchwood crew have had an encounter with the same sex at some point during the course of the First Series. Although some sources has described the characters in Torchwood are all "Bi-Sexual", Head Writer Russell T. Davies hopes to defy what watchers are reading in the cases of Monosexuality.
"Without making it political or dull, this is going to be a very bisexual programme. I want to knock down the barriers so we can't define which of the characters is gay. We need to start mixing things up, rather than thinking, 'This is a gay character and he'll only ever go off with men."
Although portrayed as Bi-Sexual, Davies announces that Jack is Omnisexual
"He'll shag anything with a hole. Jack doesn't categorise people: if he fancies you, he'll do it with you."
Much like Toshiko's comment toward Jack as "He'll shag anything if it's good looking enough".
In "Everything Changes", Ianto mockingly refers to Jack's good looks suit his sexual harassment. In the episode "Cyberwoman" the two kiss, although not one that would seem a normal kiss, but one of lust than for life. At the end of "They Keep Killing Suzie", Ianto sneaks a kiss with Jack with a proposional of a sexual nature on which the offer was only realised a few seconds later and Jack tells Ianto to meet him in his office in ten minutes.