NSFW model's strange behaviour

Hey everyone, I've started generating NSFW content using the model at this link: https://civitai.com/models/2003153?modelVersionId=2567309. However, instead of male genitalia, it's generating something that looks more like an ugly sausage, and instead of testicles, it's just producing what looks like a piece of skin. How can I achieve a normal result? Is it a prompt issue or something else? Does anyone have experience with this? Thanks in advance!