@DoubleNwah
A human's development is affected by both genetics and environment (nature vs. nurture). Identical twins share 100% of their DNA with each other--if they have sex, is it masturbation? No, it's not. These are two separate minds that share different bodies--I wouldn't count it as masturbation.
But, it is not incest either. Committing to sexual intercourse with yourself is a confusing situation. Usually incest is classified as sexual relations with a family member or someone that is too close in blood or familial connections to marry. What if you were too close in blood to be classified as incest? Can you even count a clone as a family member?
Fuck all. Throw the classifications out the window. Is it incest or masturbation? Just classify it under the hentai tag as Selfcest. Don't use your smooth brain questions to classify something like Selfcest. It is something much larger than that. Wait, when did I turn into a Selfcest nationalist, where the fuck am I going with this comment? Goodbye.