Question:
Is it wrong to suck your own penis? Does it count as sex?
Answer:
Most boys are not flexible enough to get their mouth on their own penis, so this isn’t a common concern. Realize as well that as you get older, you are most likely going to get less flexible.
Putting your penis in your mouth is not sex since another person is not involved. This would fall under the category of masturbation. You are using your mouth instead of your hands to stimulate yourself. See Is masturbation considered a sin?