Masturbation comes to us fairly naturally. Puberty strikes and we begin to discover the pleasure of touching, playing, and stroking. At some point along that path, we find the arousal increasing and experience our first waking ejaculation.
I say "waking" because wet a dream - cumming during sleep - may have already hit.
Either one may take us by surprise. It all depends on whether and what we've been taught (told) ahead of time. Some guys experience guilt and fear. They hide it from everyone, furtively stroking away to complete the task as rapidly as possible.
Even when after they've matured and have plenty of privacy and freedom, the tendency is to make that hand move up and down the shaft as fast as possible. These are the ones who could use instruction, a bit of coaching.
Slow down. Take your time. Never stroke faster than you can thrust your hips.
The journey should be pleasurable.
The finish extraordinary.