As for the realism of breasts and male genitalia of out-of the box figures, it is good to realize that the fact they have no clothes on does not mean they represent nudes. They are, I think, modelled with the intention of being dressed. 

Breasts as modelled have by default a shape commendurate with being cupped in a bra. In a way, it would be inconveinient when default breasts are sagged out because they would poke trough the clothes. There are 'natural' morphs one can apply otherwise. And, of course, the 'barbie' figure is a recognized style.

The male dangly bits are in a form commensurate with comfy suspension.  For the male figures the gen-nogen option helps.