Your body is ging to release the semen regardless of if you masturbate, so why not do it in a healthy and endorphin releasing way. Maybe your unease is the fact that you have a problem with the porn, moreso than the masturbation. Do you have an attraction to things that might be considered taboo? There is nothing wrong with fetishes, as long as they aren't harming or dehumanizing other people without their consent. Somaybe re-evaluate your methods and material?