V2
I got annoyed by the quality of this and fixed everything. Better backgrounds, UHD, more accurate, less style influence, and super easy prompt:
subject with a boner
V1 is a pain to use (but can get good results). Use V2 for ease.
Strength .5-1.1 depending style, sampler, etc. Intended for awkward/inappropriate covered boners, not actual exposed boners. When it occasionally does try to show it, it seems it thinks the boner is a balloon or thigh.
You can really describe it however- erection, boner, etc. and if your prompt shows their front, you need no trigger, but for ease and consistent boner comedy, go straight to the point and try
with a sharp/mighty/pointy/etc. erect boner in their pants/dress/skirt/groin/crotch/etc.
It was trained on "with a casual boner" which works, but is very dependent on your prompt positioning the subject and likes to do the aforementioned balloon thing sometimes.
This works very well with other LoRAs. In fact, I retrained this a good 15 times until I was happy with it maintaining character likeness. Can also do good FUPAs with some prompt tweaking.