This LORA is built on top of URPM (Uber Realistic Porn Merge) V1.3. Use that model for best results.

https://civarchive.com/models/2661/uber-realistic-porn-merge-urpm

Feel free to experiment with other NSFW models - Realistic Vision also seems to work.

It is recommended that this LORA be used at a strength of around 0.6 in combination with hi-res fix's latent upscaler (with 0.55 denoising strength). Of course, there are no hard rules around this.

The keywords "penis" (without quotes) should be used for best results, refer to the example images and their respective prompts. You may add erection or flaccid to specify the state of the dick, and/or testicles.

Add (masturbation) to the negative prompt if you are getting too many hands holding floating dicks.

If the pubes are too bushy, add "excessive public hair" to the negative prompt.

SD struggles in general with genitals so don't expect perfect looking cocks all the time but you do get some good ones now and then - it's a hit or miss - just keep generating.