I am 28 years old. L get sexual gratification by some perverted sexual fantasies like sex with my aunt. I got a lot of sexual pleasures from this fantasy and masturbation. I like to fantasies about women much older to me than younger to me. Also I get fantasies about women most of them are my relatives very close relatives. Do such fantasies create negative energy? Are these fantasies harmful for mental stability? Are such fantasies morally incorrect or sin? Why do I get more pleasure by imagining about these women then who are of my age. Is it some mental disease which needs to be treated or harmless?