what does "soft-porn perversity" mean here
There is a soft-porn perversity about many of Fuseli's muscular super-heroes and nubile nymphs, particularly his Titania from “A Midsummer Night's Dream”. The erotic drawings and prints by him and his pupil Theodor von Holst are so explicit that the Tate has hung a veil between them and Fuseli's popular fairy paintings nearby, which are a favourite with children.

Question

what does "soft-porn perversity" mean here
There is a soft-porn perversity about many of Fuseli's muscular super-heroes and nubile nymphs, particularly his Titania from “A Midsummer Night's Dream”. The erotic drawings and prints by him and his pupil Theodor von Holst are so explicit that the Tate has hung a veil between them and Fuseli's popular fairy paintings nearby, which are a favourite with children.

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It seems to me that you are reading material which is far above your English level.

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Fuseli's muscular super-heroes and nubile nymphs are like softcore pornography (often abbreviated to soft porn)  because they are less sexually explicit than hardcore pornography. Softcore pornography may depict  just nudity.

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what´s a manner piece of shit. I have a large prick ready to fuck your holes all day

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Exelent articles, tell me where do you get them from.
soft porn perversity means high sensual content, not sexual, if you have Seen Ranma  1/2 you would relate pretty easily. Visual demonstrations in a sensual manner, such as a woman with with long skirt which gets blown by the wind until you can see the begging of her panties, but without seeing anything else