Recommendations:
Sampler: DPM++ SDE Karras (Highly recommended but if it's giving you trouble, try Euler a)
Steps: 7-10 (start with 8)
CFG: 2-5 (start with 3)
Clip skip: 1 (I haven't played with 2 but it might work?)
Sizes: 832x1216, 896x1152, 1024x1024, 1152x896, 1216x832
VAE: This should have a baked VAE. I still use the SDXL-Vae fix with it just to be safe.
Positive Prompts: Keep them as simple as "one man" or as complex as you wish. This model tends to understand both BLIP-style and Booru tags, I recommend mixing them both. Start your prompt with composition, then define specifics you want to see, and wrap it up with style. Sometimes full sentences work well.
Negative Prompts: Keep them simple and to the point! Enough with the paragraphs of tokens, they typically make results worse.
Hires Fix: 8-12 steps, keep denoising strength between 0.15-0.3
ADetailer: Absolutely recommended, use at 0.4 denoise on faces. Add in Penis Adetailer for enhancement as well, set your mask blur to 8.