Under-endowed men! Want to win an iPhone? All you have to do is take a snap of your penis "in rigid mode" alongside a tape measure then send it to SingleSex.dk. (We repeat: send it to Singlesex.dk. Not us. Please. We really can't stress that enough.)

Yes, the Danish erotica website is holding a competition to find the smallest penis on the planet. And the man with the shortest member will win a swanky new smartphone. Really, what's not to love?

But that's not all! The website's female users will also be asked to peruse the snaps of teeny-tiny todgers then vote for their favourites. And the owner of the most popular pint-size penis will win another - as yet unspecified - prize.

So why hold the competition in the first place? "The smallest is the extreme," website owner Morten Fabricus told news agency AFP. "It's a competition, which is weird and funny and almost too much. It's a competition which is at the core of manhood, the most important thing for a man."

Thanks for that, Morten. Anything else to add? Well, yes, actually. "There are so many unhappy men out there, who think you have to have a giant penis, but it's not normal to have a huge one."

So the Guinness World Records gang may soon be obliged to find room for a "wee willy winkie" among their chronicles of great human achievements and accolades. And while you ponder over that thought, perhaps you'd like to take a look at some more amazing world record holders...

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  • Heaviest rideable bicycle

    The heaviest rideable bicycle weighs 750 kg (1650 lb) and was built by Wouter van den Bosch (Netherlands) and ridden in Arnhem, Netherlands. (Credit: Guinness World Records)

  • Heaviest Sportswoman

    The heaviest competing sportswoman living is Sharran Alexander (UK) of London, UK, who weighed 203.21 kg (448 lbs). (Credit: Guinness World Records)

  • Largest drum set

    The largest drum set is comprised of 340 pieces, is owned by Dr. Mark Temperato (USA) and was counted in Lakeville, New York, USA. Dr. Mark Temperato is a member of the band called Jesus the Soul Solution. He transports the drum set in a custom-built trailer. (Credit: Guinness World Records)

  • Largest biceps

    The largest biceps male belong to Mostafa Ismail (Egypt) and were measured for left arm flexed at 64.77 cm (25.5 in) and non-flexed 62.23 cm (24.5 in) and for right arm flexed at 63.5 cm (25 in) and non-flexed 60.96 cm (24 in). The measurements were taken in Franklin, Massachusetts, USA which is where Mostafa now resides. (Credit: Guinness World Records)

  • Tallest mohican

    The tallest mohican measures 113.5 cm (44.68 in) and belongs to Kazuhiro Watanabe (Japan). The length was verified at Bloc de l'art hair salon, Shibuya, Tokyo, Japan. (Credit: Guinness World Records)

  • Tallest mohican

    The tallest mohican measures 113.5 cm (44.68 in) and belongs to Kazuhiro Watanabe (Japan). The length was verified at Bloc de l'art hair salon, Shibuya, Tokyo, Japan. (Credit: Guinness World Records)

  • Tallest mohican

    The tallest mohican measures 113.5 cm (44.68 in) and belongs to Kazuhiro Watanabe (Japan). The length was verified at Bloc de l'art hair salon, Shibuya, Tokyo, Japan. (Credit: Guinness World Records)

  • Tallest mohican

    The tallest mohican measures 113.5 cm (44.68 in) and belongs to Kazuhiro Watanabe (Japan). The length was verified at Bloc de l'art hair salon, Shibuya, Tokyo, Japan. (Credit: Guinness World Records)

  • Largest collection of Hello Kitty memorabilia

    Asako Kanda (Japan) has 4,519 different Hello Kitty items. Her house is filled with Hello Kitty items, such as Hello Kitty frying pan, Hello Kitty electric fan and Hello Kitty toilet seat! (Credit: Guinness World Records)

  • Youngest Drummer

    The youngest professional drummer is Julian Pavone (USA) (b. 14 May 2004) as of 21 March 2010, he was 5 years 10 months 3 days old. (Credit: Guinness World Records)

  • Oldest gymnast

    The oldest gymnast is Johanna Quaas (b. 20 November 1925, Germany) who, at the age of 86 years, is a regular competitor in the amateur competition Landes-Seniorenspiele, staged in Saxony, Germany. She performed a floor-and-beam routine on the set of 'Lo Show dei Record' in Rome, Italy. (Credit: Guinness World Records)

  • Largest collection of Barbie dolls

    Bettina Dorfmann (Germany) has 15,000 different Barbie dolls, that she has collected since 1993. (Credit: Guinness World Records)