A new report shows League of Legends maker Riot Games to have a pervasively sexist working culture.

That's according to an investigation by Kotaku in which the site has spoken to 28 former and current employees. The site alleges that 80 per cent of the LA firm's workforce are male and has a working culture that is hostile towards women.

Three women speaking to Kotaku say they were groomed for promotions, as well as doing work above their pay and title before men replaced them. Male bosses or colleagues are also reported to have sent unsolicited dick pics to other members of staff. One women describes seeing an email thread in which she was described as being on a list made by senior management talking about who had slept with her.

“The ‘bro culture’ there is so real,” said one female source who claims to have left Riot due to the culture.

“It’s agonisingly real. It’s like working at a giant fraternity.”

Riot's hiring practices have also come under fire, with the firm opting to hire and promote 'core gamers' which one source claims is an excuse for not hiring talented women.

The company also reportedly checks the League of Legends stats of prospective employees. Hiring from 'core gamers' and LoL players means there's also a much bigger pool of men to women.

In a statement, Riot said: “To ensure our aspirational culture becomes a reality and isn’t lost in translation, we must over-index on cultural reinforcement. We believe hiring gamers is critical to our success.”

Check out the full article for a glimpse at what Riot's working culture is like.