Cumming is the final episode, the climax of any sex act (for most, anyway), and it is the most intense and memorable part of it. Be it fucking, getting a blowjob, or jerking off, that culmination is what makes the sex worth your while. That`s why it`s so important where you actually do it, and a girl`s face seems to be the place of choice for many guys, turning it into a sticky facial. It may be that visually it`s stimulating to watch your cum drench a chick`s features, or be it that a "cum face" gives you a sense of possession or culmination, but the truth be told, there is no guy out there who doesn`t enjoy squirting his load on a pretty girl`s face and mouth.