I've watched a lot of amateur porn and cam couples and guys almost never go down on girls, and if they do it's a token gesture. I can't blame them, it's disgusting down there. And guys fucking, both pro and amateur, almost never touch/work the clit while fucking. The clit is the female equivalent to the head/underside of the tip of the penis, only more sensitive. It's the focal point of female stimulation. Expecting a girl to cum from penetration is like expecting a guy to cum from playing with his balls. Watch James Deen porn, he always gets girls repeatedly by rubbing their clit while fucking them. Of course, he's a chad and is aggressive/dominant as well.
I wish I didn't watch porn but I'm an addict and it's one of my few copes.