>>2839725SD1.5 models can be pretty bad at drawing genitals, especially the more dated models such as base nai or aom.
Although you can improve it by using newer models and loras for genitals / artist styles.
If you have the VRAM, maybe consider running SDXL instead.
You can use pony diffusion or autism_mix from civitai along with forge UI to lessen the VRAM requirements.