According to Socrates through Plato's Phaedo
The Body knows pleasure through senses, whereas the sould gains wisdom through the intellect. The ultimate of philosphy, can be achieved only when the sould is no longer deceived by sessual pleasures. So, the Philosopher's soul longing to be free of bodily wants , desires an escape fom the body's sntrapment.
This is the most important part: From body's lusts and fears come fighting, greed and warbut from the intelelct come justice and beauty.
So, yes Pornography is bad for a philospher and it hinders the thought for sure.