What are the only good reasons to masturbate, the straight forward ones? You see I am uncut and when I am about to you know, I tend to hold the extra skin blocking the stuff from coming out. I am starting to let it come out but all it does is sit there in the hole. People say it sometimes is supposed to squirt out onto you or something. So what should I do?
There is no requirement for masturbating, though just about every male past puberty has tried it at least once and most regularly for a while.
Let's discuss the physical aspect of the issue. Your body has two seminal vesicles, which are located just below and behind the bladder. These vesicles constantly produce semen and eventually they get full. That is what you feel when you try to go without ejaculating. As they get full, your body gets more sensitive to sexual touch. Your mind also tends to move to sexual ideas and you start feeling like you are going crazy.
The design of the male body is to get rid of older semen to make room for fresh material. To get rid of the excess, you actually have to ejaculate.
One way that excess is taken care of is an instinctive response by the body when your seminal vesicles get full. During the dream stage of sleep (also known as the REM or Rapid Eye Movement stage), your body automatically gets an erection. You have four to six erections every night, but you only notice the last one when you wake up in the morning. Since your penis and glans are hypersensitive because the seminal vesicles are full, your body responds by rubbing your penis. Eventually you reach orgasm and ejaculate. For some men, they sleep so soundly that don't realize it happened until they wake up in the morning. Others semi-wake while it is going on, but fall right back to sleep when it is over. Others come fully awake just before reaching the point of ejaculating.
Almost 100% of men discover at some point how to masturbate and trigger an ejaculation. The feeling of pleasure that comes with orgasm and the relief of ejaculating is so intense that it is common for young men to pursue it. But again, the design of the body is that it is easiest to ejaculate when the seminal vesicles are full, but harder when they get close to empty.
Some men use masturbation to avoid having wet dreams -- either because they don't want the mess in their beds or because they don't like the dreams that happen. Some also use masturbation to keep their sexual desire down to a controllable level.
A poor reason to masturbate is purely for enjoying the feeling. Many boys, in a desire to ejaculate more often, pursue sexual images (pornography) to get their bodies aroused sufficiently, even when their seminal vesicles aren't full. Pornography is wrong because it is pursuing lust and lewdness. "Let us walk properly, as in the day, not in revelry and drunkenness, not in lewdness and lust, not in strife and envy. But put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts" (Romans 13:13-14).
Trying to hold back an ejaculation isn't a good idea. The force of the semen trying to come out the end of your penis can push backwards and force semen up into the bladder. Such hurts and can let to a bladder infection. Holding your foreskin may work for a while because there is room from the semen to go somewhere, but eventually your penis is going to get bigger and there won't be excess foreskin available when you are erect.
If you need to ejaculate and you don't want a mess to clean up, let me suggest doing it in the shower where you can wash up afterwards.