Hey
MrX ,
Smoothness is correct.
If you wanted to make a Futa character, ie one with female shape including breasts but have male genitalia, load up a futa skin preset, and tick the 'use female morphs on male model' box.
For a femboy look, which (to me anyway) is just a male figure with a feminine appearance, I would still use female morphs and just very slightly tweak some of them, slightly more curve hips and thigh etc. You might even achieve this without a futa preset skin by playing with various morphs, especially some of the community made ones. Not only is sexuality multi-faceted rather than a single gay/straight continuum, bodies can be too. In my late teens and 20's, my body actually was very feminine, despite being quite fit and doing a lot of sports, I never got muscly, but had slim waist and curved hips, with a feminine hairstyle and some subtle make-up there was more than a few occasions I was taken for female
Unfortunately middle age spread hit and that went haha
I've always maintained an aesthetic appreciation for that kind of form and look tho.