try your very best to justify the act of satisfying natural urges with unnatural stimulus.
when you are aroused lines and colours which were products of human minds and not by nature then you shift your sexuality from the real to the abstract. while one could argue pornographic actors and actresses are also "fake" due to make-up/surgeries that overlooks the fact that the actors did look that way at that specific point in time.whether they look like that all the time is irrelevant. it was possible once and is therefore within the realm of the real. cartoons never reach that point because no matter how talented the artist, the images will always be 100% products of the human mind and therefore more symbolic and abstract than real life pornography.
i'm not sure what effects what shifting sexuality from realistic to symbolic will do to the human psyche. (from the posts of some of you i imagine anxiety/depression is either a cause or correlation to this kind of thing). but if psychoanalytical case studies are any indicator than it's not great.
any way try your best to explain why you hate real life so much that you have to jack your pud to cartoons.