I guess
redknight00 answer was targeting the "all age" part, more than its "none pornographic" implication. Because yes there's games without sexual content. I also kind of remember having seen one or two without even nudity or effective eroticism ; but perhaps the staff changed its mind on this and removed their threads.
Games here have to be rated +18. This either because of their eroticism content (CG or story), or I guess because of their mature theme (horror, dark thriller) ; once again unless the staff changed its mind.
But obviously, if it's a game with no "adult" values, like a regular shoot'm'all, a regular plateformer, and so on, it don't have its place here.