Come for the porn, stay for the plot/writing/characters.
Although.... some of these plots might be... cough Kana cough... maybe toeing the line on what might be my cup of tea. I'd hate to think I'm getting corrupted... But it's all generally on the tasteful side. Although that one scene with Lena and "people don't have control over their bodies" and the collar and going against their prior intentions to not lick her belly... hmm... I'm probably reading too much into it, but it's stuck with me.