Both classical and operant conditioning are clearly in play when it comes to porn usage.

Researchers at Tel Aviv University have discovered that the brain cannot learn simultaneously through both classical conditioning and operant conditioning. In fact, the brain actively prevents the ...

Operant conditioning is different to classical conditioning, and it focuses on using either reward or punishment as an incentive to increase or decrease the presence of certain behaviours.

Gregory Razran, Operant vs. Classical Conditioning, The American Journal of Psychology, Vol. 68, No. 3 (Sep., 1955), pp. 489-490 ...

The most important thing to remember is that classical conditioning involves automatic or reflexive responses, and not voluntary behavior (that's operant conditioning, and that is a different post).

Both classical and operant conditioning are clearly in play when it comes to porn usage.