I started some time ago to use the Waifu Sex Simulator with my VR glasses to create life like sex, gore or other scenes.
The Waifu simulator uses MMD models (pmx) and I therefore learned how I could import new models and how I could manipulate models (just basic stuff) in the PMX editor.
Then I learned that XNALARA (xps) models could be converted (via Blender) to MMD and a lot more models became accessible. It seems also possible to convert DAZ3D(?) to XNALARA and then to MMD, but I have not looked into this.

I found a lot of models over the the time. There are basically three sources
Deviantart (for MMD and XPS)
MMDArchive (mmda booru)
bowlroll ().

But I am missing some type of models I do not find on any of this sites. I would like to have nude (they do not have to have genitals) models of slim and athletic teen boys / young males.

As MMD is very famous in Japan, there are tons of nude female teens, but just very few boy models (with very low detail textures).
In XNALARA there a lot of nude "hunk / muscle" models with great textures, but no young and slim boys. At least I can't find them.

For example, there are some nice bodies in this picture on this board. http://gurochanocizhuhg.onion/3dcg/src/1453913650202.jpg

Where could I get such 3D models as XNALARA or MMD?
Are there any other sites I can look for such models? Am I using the wrong search terms?
What sites do you get your 3D models from?