They are basically saying don't be purposefully explicit, don't play A Serbian film the game.
But certain cable shows ( anything on fx, syfy, amc) are actually the style of games most of us are shooting for. Sometimes there's some extreme violence or some colorful language maybe even some sordid situations but they're handled with taste. And when possible they frame it and hint at it rather then showing it.
However some pay cable shows would be great like the wire, Rome, boardwalk empire, and a game of thrones they never delve into purposefully explicit. However for running a game here using those shows as a basis or an influence one would have to hint at rather then show a few things that's all.
Now given this is just my opinion but as the mod's have stated there's no hard and fast rule here just try to stay teen rated and use common sense.
The only thing I worry with is people ( other users) with different views then my own deciding something I've done is questionable and reporting it based on their moral values rather then the site's guide lines.
All that said I trust you guys, but if a heart needs ripped out or someone seduced in my games it will be happening Mwah ha ha ha. . . .