I do have a portfolio, on a freelancing site and work examples. but I don't really want to link those here...
You are free to add me via discord:
Stilton #4224
I might not have enough relevant examples though, because whilst i said that half-jokingly (because it'll always be cheaper to buy something that's already available than to commission a person to make you something new). If you are looking strictly for examples of genitalia close up shots, i'm afraid that's not really something i have - sorry.
At this point, i'd argue 3d modelling 'realism' is like being a draftsman in real life... You know, someone who knocks up building plans... It's fairly well documented process. There's a structure you must adhere to, etc. None of it is 'black magic' -- if you have good reference material and are willing to invest the time, its quite easy to produce whatever you want.
But even the best models will look bad presented with off lighting. Presenting the models with good lighting / animations / sound mixing is as important to maintain the illusion, imo...