When a person is born, they don’t have this particular reflex, but as someone grows old, there’s a big chance that they would develop it.
The gag reflex is an important function of a person’s body, but it hinders a woman to have a big hard cock going in and out of her mouth. And sure enough, a man’s dick would hit all of those targets if he tries to put his dick in deeper than her mouth. Once a foreign object touches the back of your throat, the roof of your mouth, the back of your tongue, or even the area around your tonsils, the back of your throat gets triggered and contracts so that the foreign object causing that discomfort would not get past those areas. The main reason why a woman just can’t do that is because of her gag reflex. In fact, it might even be easier to find a four-leaf clover than to find a girl who could open her mouth wide to accept the whole length and girth of your cock. Wouldn’t it be nice to find a girl who could just put your dick in her mouth, from head to balls? Not all girls are like that.