Which skins are you using? There are many variations. I reccomend F-inev or Miss Onatopp
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F-inev has created highly detailed genitals. Way more detailed than I could ever do.
Miss Onatopp not so detailed but still really pretty skins, and what I use for my dark elves. A big plus is that she has created skins for default races too.
http://www.tesnexus.com/downloads/file.php?id=19021http://www.tesnexus.com/downloads/file.php?id=12424They both have matching face textures
I also reccomend Luchiare's neck seam hider
=edit= I have taken the time to add the jewelry to all the clothing and armor in my game. I will never have to look at another neck seam again.
http://www.tesnexus.com/downloads/file.php?id=18669Petrovich also has some pretty jewelry that will hide the neck seam.
http://www.tesnexus.com/downloads/file.php?id=29994http://www.tesnexus.com/downloads/file.php?id=19991The mod says uff but the neck size is the same on all bodies.
Also that image looks like bab and not hgec, In which case the hgec links I sent will not help. Bab has an entirely different mapping.
Also it's not that hard to darken bits if that is what you want to do.