I prefer pictures of heroes being forced and abused. Willing prey doesn't stimulate me very much. Show me a beaten hero, forced to kneel, with cum dripping from his chin and my cock will respond.
You put "superman" and "nude" in the same prompt, you'll get stuff like this (depending on the model used). It's going to require some further tweaking and prompt handling, but I think it's doable:

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which program and prompt
I have Automatic1111 installed locally. For the images above, I used the DreamingWildv1.0 model, and this is my prompt:

"epic detail, epic quality, fantastic realism, nude superman, superhero, beaten, whipped, sweating, crying, battle scars, messy hair, being forced to succumb to kryptonite poisoning, kneeling, cum dripping from chin, nude, erect penis:1 up, master, homoerotic"