It's one of the most unlikely fetishes on the web - and it's surprisingly popular.

People who are turned on by sneezing or watching other people sneezing share their stories and kinks online, and the Sneezing Fetish Forum has almost 500,000 posts.

In it, members have wrestled with where their unique kink comes from.

One man said he realised his sexual preferences were unusual before he was even a teenager.

"I realised that I had 'something' for sneezes when I was around eight years old.

"I would search for people sneezing on the computer almost constantly. When I would get home I would instantly go on the computer and look at stuff about sneezing for hours.

"Back then I had no idea why I was feeling so 'weird' but when I was 11 I figured out what a fetish was and I accpeted that I had one."

A user called SneezyRoleplay wrote: "I actually stumbled upon some sneeze fanfiction and I was in heaven and now I'm part of the forum and loving it."

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Some document their attempts to get sick so they can sneeze all day.

A member of a sneezing forum wrote: "I know this is weird, but I just like being sick and my immune system is ridiculously strong.

"Maybe I just need some exposure to the cold weather to put me over the edge. So tonight I'm soaking my feet in cold water and going for a run outside."

Others describe seeing sneezes in real life, with one man writing about a woman he saw sneeze: "She had a amazing pre-sneeze face."

A section called 'media archives' allows users to share clips of celebrities, sports stars and members of the public who've been caught sneezing on TV or in films.

A clip of tennis star Rafa Nadal sneezing on court prompted a response from one user saying: "Oh. MYYYYYYYYYYYYY... THANK YOU for sharing this!!!"

Others shared more clips of him sneezing, with one person saying they'd discovered a "goldmine of gorgeous photo sneezes".

The written commentary on the clips people share are restrained for a fetish site, but all the more bizarre for it.

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A recent clip shared titled "QI sneezes" feature two people sneezing during the popular BBC quiz show.

The user's post said: "Firstly, at 13.20 you can see Cariad Lloyd sneeze (unfortunately you can't hear it) and afterwards she makes a cute comment that she is allergic to the picture of the horse.

"Secondly, at 17.26 a woman in the audience sneezes and Phil Jupitus blesses her."