adventure games, known as "Adult Interactive Fiction" or AIF. Modern consumer virtual reality headsets, such as the Oculus Rift and HTC Vive, allow users to engage in virtual sex through simulated environments. An example is VR Kanojo. 2010s Blizzard Entertainment's 2016 game Overwatch has inspired a notable amount of fan-made porn. Short porn videos featuring official characters have been animated via Source Filmmaker and are popular on porn sites such as Pornhub and YouPorn. Despite its popularity, Blizzard has issued cease-and-desist orders to some of the creators. Indie games have expanded the reach of adult games, and Steam now allows adult games onto its storefront. Patreon provides direct funding to adult developers, allowing games like Hardcoded to appeal to niche markets that previously would not have been created. The continuing rise of open-source software development practices has also influenced adult video games, allowing communities of amateurs to collaboratively create and distribute adult games via the Internet. Eroge In 1982, Japan's Koei, founded by husband-and-wife team Yoichi and Keiko Erikawa (and later known for strategy video games), released the first erotic computer game with sexually explicit graphics, Night Life, an early graphic adventure game for the NEC PC-8801. That same year, Koei released another erotic title, Danchi Tsuma no Yuwaku (Seduction of the Condominium Wife), which was an early role-playing adventure game with colour graphics, owing to the eight-color palette of the NEC PC-8001 computer. It became a hit, helping Koei become a major software company. In another opinion, Yuji Horii recalled in 1986 that he saw a demonstration of a Yakyūken-like game running on the FM-8 in the end of 1981, and he considered Yakyūken was the origin of adult games. Some writers say that Yakyūken (1981) produced for Sharp MZ computers by Hudson Soft is the first Japanese adult game. Like with Koei, several other now-famous Japanese companies such as Enix, Square and Nihon Falcom also released erotic adult games for the PC-8801 computer in the early 1980s before they became mainstream. Early eroge usually had simplistic stories and extreme sexual content, such as rape and lolicon. In some of the early erotic games, the erotic content is meaningfully integrated into a thoughtful and mature storyline, though others often used it as simply an excuse for pornography. In 1999, Key released Kanon. It contains about 7 brief erotic scenes in a sentimental story the size of a long novel