Seth Rogan has revealed that he introduced one of the most famous movie stars in the world to the world of online porn.

Regardless of your views on internet pornography, it's fair to say that most people who have ever been on the internet are aware it contains a huge amount of adult entertainment. In fact, one report in the BBC suggested that as much as 30% of all internet traffic is related to pornography.

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But apparently star of Mission Impossible Tom Cruise was actually oblivious to this entire section of the internet. I'm not sure quite how it's possible to not know that porn exists on the internet. It's like having never seen a Disney movie.

Nonetheless, Seth Rogan told Late Night with Seth Meyers that he was the person who introduced the Top Gun star to the world of online adult entertainment.

Rogan told Meyers: "He didn't know internet pornography existed."

The comedian had been over to visit Cruise while filming Knocked Up. He claimed that he wasn't sure quite how the conversation had turned to internet pornography, but that Cruise's reaction had been unexpected.

He said: "I think it just came up organically, like how it does you know. And then 'oh my friends were looking at internet porn', and he was like 'whoa whoa whoa, what'?"

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Meyers asked if it was possible the 'world famous actor', might have been having him on. But Rogan was convinced.

He said: "I 100% believed he had no idea that there was pornography on the World Wide Web. Which, the first thing I knew about the World Wide Web was that there was pornography on it. That's the only reason I know it exists!"

And it turns out that introducing Tom Cruise to internet porn was not the only interesting takeaway from visiting the house of the star of Interview With a Vampire.

When he arrived at the house, Rogan confided that he had been desperate to go to the toilet. It's not an ideal situation, arriving at the house of one of the most famous actors in the world and being desperate for a pee.

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Rogan revealed: "The first time I met him I had to pee so badly as we were pulling into his house.

"I was so uncomfortable, I didn't want the first thing to be 'Hi I'm Seth Rogan nice to meet you, I have to pee, can I pee in your house?'

"Halfway up the driveway I got a snapple bottle and I peed in the bottle. Looking back there's no way he does not have cameras covering that driveway."

So there you go. Not only did Seth Rogan introduce Tom Cruise to internet porn, it's possible that Tom Cruise also has CCTV footage of Seth Rogan peeing in a bottle.

There truly is no business like show business.