Yes of course, Druuna is an adult setting which tends on pornography. But behind this there is much of a Morcockian feeling, especially with the chaotic feature of the "Evil". But let us be fair, isn't sex linked to the decadence of civilization? Moreover this society becomes decadent because of the virus.
Anyway I think Druuna is more a representation of the nightmare type where you can't evade your foes whereever you go.
As to hassanisabbah thought's about Howard: You should read on the REHUPA site what kind of books Howard did read: in his library there were some items about spanking and what we would now call bondage. Don't forget he lived in the '20's and that imagination (as well as censorship and ethic code has know much development since then). In many of his stories, women are often scantily clad and in one story there is even a Stygian witch who binds and floggs a (naked) slave girl. Yes I think Howard would have been much farther if censorship of the time would allow.
As an example, if you know the book "Emmanuelle" (which gave its name to some films), it was written in 1959 and it was a long time before its release would be authorized.
Then if you know Hawkmoon (or Corum), you already know that there is much gratuitous violence in these stories. However I didn't suggest Druuna as a setting of sexual depravity but because it features an interesting postapocalyptic setting.