This was an informal request and can be subtle.
The coronal sulcus (also called the balanopreputial sulcus or neck of the penis) is the deep, circular groove or furrow located at the base of the glans penis that separates the head (glans) from the penile shaftIn a sense, this model increases the size of said groove and adds space between the glans and the shaft.
FYI This dataset contains zero men so if it works for men, great but I have not and will not test for it.
Side note: I do take informal requests(basically a bounty that you don't have to pony up buzz for) if I like the idea(Tips are nice but not required since if it's a good idea then I'll get generation Buzz). Just leave a comment on one of my models or DM me. (Comments are preferred since that let's other people see that I'm actually fulfilling informal requests.) DMs are perfectly acceptable if your request is a bit out there and needs some image examples or something.