Model to emphasise veiny penises as I found the inherent model knowledge on most models was a bit weak. Trigger is "veinyd", suggest also using "veiny penis", I tested with a tag weight around 1.2, model weight 1. Makes penis bigger too.

NOTE: since it is trying to add details to a penis, works better for (and may bias poses toward) non-penetration settings, because that's when the penis is visible. But does still work for penetration scenes.