Nudity & gore in TV

Why do HBO series have so much nudity & violence? Exposed breast, mooning, full frontal nudity is a norm. I wonder if there is any episode of Spartacus or Game of throne devoid of them.  The bloodshed & gory scenes of maiming, beheading, corporal punishment is quite unsettling.
Spartacus depicts the promiscuity of the Roman culture. Gladiators & gore cannot be separated. Hence I can understand their story-line.
However Game of thrones is a fictional book (far away from the original story if anybody cares to read.) Why has all the women depicted need to be a whore or use sexuality as a tool to serve their political purpose. What kind of culture & story are they trying to depict. What is the message are they trying to send. Are we so primitive that primal urges of blood and carnal pleasures are the only things that we seek? Isn’t there more to civilization than whores, wines & massacre?