THE ORIGINAL AUTHOR IS ffjggrtbjibv
V1 (BetterCocks) is the same Model as author's Tgirls Model https://civitai.com/models/8328/tgirls . Even tough it was not the intended main purpose it works very well for creating good looking cocks for man, expecially erect cocks.
As most people who want to create men would not download a tgirl model author decided to publish it seperatly.
V1_flaccid: was trained with more images of flaccid cocks. It can do erect as well but the regular version is likely better for erect cocks.
All the samples were created with Ares Mix or Mars Mix but all models, even Anime models seem to work.
The recommended strength is 0.45-0.9, but you can experiement. Highres Fix with ~0.5 denoising seems to significantly improve details in most cases.
CAUTION: as is was initially created to create Tgirls all women in you images will grow a penis :D.