If you want your girls or boys to have small penises you need to try out this LoRA. I did some testing myself and got some really well generated art, even for other styles like 3D anime.

The SD1.5 model has been trained on 551 manually picked images for 20 epochs.
The Anima model has been trained on 400-500 manually selected images.

For strength I recommend using the default 1.0 but you can also try changing this for different results.

Some keywords that work well in combination: (I recommend using either erection or flaccid and not both of them)

otoko_no_ko, erection, flaccid