If something fits perfectly in a mouth, it is a penis. We instinctively learn it as a child. We put a thumb in our mouth and feel safer with it. We have to unlearn that later because the teeth can grow crooked, that’s how much we like it.
Mouths are extremely healthy for penises. In addition, a man’s penis is one of the most intimate places. Just as a woman is often afraid that a mouse will creep into her, a man is instinctively afraid that his penis will fall off. Sucking is a sign of confidence. It gives a sense of security, just like thumbs used to do as a child.

How you do it best is little described. Sometimes it is pretended to lick an ice cream. Or dare to lick. Then there is still a lot to learn about penises.
A mouth is moist, so sucking is closest to a wet jerkoff. However, the tongue is also soft, so it can hardly be make the pressure a finger can. However, the movement, the sucking, is very nice. It gets better when the foreskin is moved with it. A slight jerking motion, along with especially the tongue, not to mention the area of the frenulum is already very pleasant.
Another thing that penile nerves react to is penetration. Slowly taking a penis deeper in the mouth, especially if it is already very nice for the penis, is the best. In the meantime, don’t forget to caress the balls or massage them lightly.
Finally, read more about sperm here. If a penis is really nicely sucked and cum is no problem, even better. Swallowing or spitting out is not a problem in itself. Although spitting it out suggests you think that penis is dirty. Which it never is. Once a penis has shot, kissing with sperm can also be very tasty. For those who really don’t have a problem with penises anymore.
There are men who can blow themselves. This is, of course, the very best way to learn to suck properly, because such men immediately feel what they are doing. Which part of the men can do it is vague. A penis does not always have to be longer than average. It is also possible at a late age. There are reports that almost every man can learn it.
It can hurt the back, and breathing is also difficult when you are blowing yourself. First of all, it is a lot of practice to make the back supple. Not to force anything. Then to find the right position. Upside down is easiest. Then try to touch the tip of the foreskin with the tongue. And so go a little further every day. At a certain point, the glans also can be touched. And after more practicing, half or the entire penis can go in and the balls can be licked. Likely, many men never learn because they find it too much trouble to practice. Or because they still find their own sperm dirty (very strange because you make it yourself and your body just makes new sperm from it).