I read A Garden Of Sand way back when I was around 16 or 17, in the late '70's. It was pretty darn racy!
It's got some nasty sex scenes, do ya, but nothing I would consider titillating. They're more in the vein Hubert Selby Jr or Jerzy Kosinski. G of S is a grimy, dark carnival ride through the Great Depression, and is one of the finest novels ever written. Tattoo is even better.