Is it porn when watching a boy ejaculate or masturbate?
One definition of pornography is "Material that is sexually explicit and intended to arouse sexual passion." Therefore, watching another person getting sexually aroused will get yourself aroused. Pornography is also "Material designed to shock the viewer in how sex is depicted." Masturbating is a private matter, not shown to other people. Seeing what should be kept private is shocking and again designed to stir up sexual feelings in the viewer. Hence, it is pornography. All pornography doesn't have to involve the opposite sex.