TV Horizon - Season 40 Episode 5 : Sexual Chemistry (Update) Horizon - Season 40 Episode 5 : Sexual Chemistry (Update) 7.516/10 by 32 users The drug Viagra revolutionised the treatment of sexual dysfunction in men on its launch five years ago. An accidental discovery, the tablet that gave impotent men the chance once more to have natural erections became the fastest selling pill in history and has earned its manufacturer, Pfizer, over $6bn. The search is now on for a similar drug that could help women. Research is revealing that female sexuality is more complex than expected. For women suffering from a loss of desire many scientists believe that drugs acting on the brain may be the way forward. A pioneering Scottish study may have identified just such a drug and begun testing it scientifically. An erection is achieved by filling the erectile tissue of the penis with blood. Blood vessels widen to allow blood in and then constrict to maintain the pressure. Male impotence was long thought to be a psychiatric effect, a result of stress, anxiety or depression. Medical advice was that there was not much to be done. Some patients refused to take this message on board. Details Casts Posters Images Title Horizon - Season 40 Episode 5 : Sexual Chemistry (Update) Alternative Titles BBC Horizon First Air Date 1964-02-04 Last Air Date 2024-07-22 Number of Episodes 1169 Number of Seasons 60 Genres Documentary, Networks BBC Two, Casts Plot Keywords , Episodes List Horizon Season 40 :Episode 1 The Mystery Of Easter Island The Mystery Of Easter Island 2003-01-09 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 2 Living Nightmare Living Nightmare 2003-01-16 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 3 Averting Armageddon Averting Armageddon 2003-01-23 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 4 Dirty Bomb Dirty Bomb 2003-01-30 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 5 Sexual Chemistry (Update) Sexual Chemistry (Update) 2003-02-13 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 6 The Day We Learned To Think The Day We Learned To Think 2003-02-20 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 7 Trial and Error Trial and Error 2003-02-27 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 8 Earthquake Storms Earthquake Storms 2003-03-06 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 9 Life On Mars (Update) Life On Mars (Update) 2003-03-27 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 10 The Secret Life Of Caves The Secret Life Of Caves 2003-04-03 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 11 God On The Brain God On The Brain 2003-04-17 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 12 Flight 587 Flight 587 2003-05-08 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 13 SARS: The True Story SARS: The True Story 2003-05-29 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 14 The Big Chill The Big Chill 2003-11-13 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 15 The Bible Code The Bible Code 2003-11-20 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 16 Last Flight of the Columbia Last Flight of the Columbia 2003-11-27 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 17 The Hunt for an AIDS Vaccine The Hunt for an AIDS Vaccine 2003-12-04 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 18 Percy Pilcher's Flying Machine Percy Pilcher's Flying Machine 2003-12-11 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before. Horizon Season 40 :Episode 19 Time Trip Time Trip 2003-12-18 Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.