Nudity in gaming books - what's too risque?

This is intended to be a dark module.  Indeed, there are going to be some mature themes sprinkled throughout Liberation of the Demon Slayer.

As an artist, I can judge for myself what the module should include or try and stay away from.  I'm a believer in artistic expression, freedom, and all that jazz. However, the artist should keep his audience in mind.

I'm not just creating this fantasy RPG adventure for my benefit.  I expect it to be used and enjoyed by those who like old school, Lovecraftian, science fantasy, gonzo mega-dungeons.  That's why I wanted to open up the floor, to get opinions on what's tastefully adult-oriented... and what's beyond the pale.

LotDS won't include anything hardcore or triple x; you won't see people actually having sex, erect (or even flacid) penises, spread-open vaginas, etc.  Nothing like that.  However, there will be boobs and butts!  As for pubic hair... that's up to you guys.

The image here on the right is, in my humble view, kind of on the border.  Personally, I like it.  The artist goes by iguana on Deviant Art.  He drew it.  I can go back and ask him to put tiny black thongs on those slave girls.  Should I?

I encourage you to voice your opinion.  What do you think - is this too risque?  Am I in danger of offending lots of OSR individuals?  Or does this herald a new retro-age of sword & sorcery exploitation pulp?  Thanks for your feedback!

VS