A decade ago, adult games that contained content of a erotic or sexual nature would have been considered fringe and non-mainstream. Lately however, adult games have made their way to the mainstream audience through the Steam Greenlight program and triple AAA titles like the Witcher, and the upcoming Cyberpunk 2077. Visual novels and puzzle games with optional adult content seems to be the norm these days, at least on Steam. Some popular titles exemplifying this include Neko-Para, Katawa-Shoujo, and HuniePop.
I only ask because a few years back a question was asked about a NSFW flash game. The question was then closed, the reasons which I do not remember clearly. I would like to know if that stance back then would still hold the same today? Where do we draw the line? Would something with borderline adult content be out of bounds? In what instance does mature content allow for questions to be asked?