Reddits, where you can promote your novels and games
- r/visualnovels (577K readers): a community for discussing visual novels.
- r/AVN_Lovers (37К readers): the place to discuss all your favourite AVNs that don't have a dedicated subreddit. Post your favourite ingame renders, share your theories about story development with other fans or proudly submit your fanart. Or do you need some recommendations of games similar to your all time favourite?
- r/LewdGames (442К readers): reviews, discussions, walkthroughs, and links to NSFW games.
- r/Futanari_Games (43К readers): the subreddit dedicated to Futanari Games.
- r/PornyGames (2.8К readers): a comunity to share all about your favorite porn games.
- r/PornGamesGifs (34К readers): free Porn Games Gifs and other 3D Sex Gifs.
- r/newadultgames (5.6К readers)
- r/goodadultgaming (1.9К readers): place for quality adult games, by devs for all.
- r/Animations_NSFW (96К readers): animation for adults.
- r/NSFWgaming (333К readers): a place where game developers and users can come to share NSFW games and discuss any questions they may have.
- r/nextgenporn (1,2К readers): A 3dx porn sharing community! connect with fans and 3dx artists. featuring any genre and category imaginable.
- r/eroge (23К readers): this subreddit is dedicated to eroge discussion - no matter what it is!
- r/porngames (14К readers): For all things NSFW gaming. Discussions, steamy releases, and catch up on the latest hentai game industry buzz.
- r/Naughty_Games (4К readers): a community for ALL Adult Games & related things!
Promotion tips
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For me, I sell JP related porn games. So, what I would do is create GIF gameplays on pixiv and deviantart.
Xvideos and Rule34video is also good for video advertising (even if you are apealing for western customers).
Xvideos does not let you link, but Pixiv, Deviantart, Rule34 lets you link your site if not Twitter. Nothing too crazy, but 2000~4000 views per video without varification and it leads to 0~1 sales per day. If you do it consistently, it is viable. Source.