Quote - The M4 gens seem to be a new model, I haven't looked that closely.

 

Careful, wouldn't want to poke an eye out. ;)

Quote - There is a separate installer for the gens, I don't remember if that is included with the free base version or if it came with the Morphs++ package.

Genitals don't come with the base version.
For that matter, V4.2 base textures have no nipples or pubic hair, but M4 base textures do have pubes and nips. Go figure.