In the last year+ steam has started selling quite a few VN's with separate "restoration" patches from the development studios. Essentially there are a few high/low quality hentai novel games on steam now. Steam shows your friends games you own/buy, so they might be interested in buying them/talking to you about them.
I have been considering getting one or two. But at least it's nice to be able to actually buy it so the creators get some money, instead of the good old free way.