In a discussion I had with a group of ladies, I asked them what physical characteristic of a man makes him sexually attractive. After eyes and lips, the answer was overwhelmingly hands. Sure, girls might want to see a nice ass, strong thighs, or broad shoulders, but if a man has nice hands, women will notice him. I know you guys are rubbing your heads and thinking to yourself...uh yeah...sure. But hear me out.
In every relationship I've had with another woman, as different in nature and varied as they were, each sexual experience had one thing in common. Fingering. Lots and lots of fingering. It's not as if we didn't have dildos, vibrators, strap-ons, etc laying around to use. We just chose not to. And even though no one eats pussy better than a woman, that's not how we spent the majority of our time in bed either. It always went back to fingers. And I'll tell you why. For a woman, it is ten times easier to have an orgasm from fingering than from fucking or even being eaten out. (If done correctly anyway.)
You have to take into consideration that in order for a woman to have an orgasm, not only must all the right spots down below be stimulated, but she has to be able to relax and let go all at the same time. That can be kinda difficult when you have someone's face buried between your thighs, practically begging you to cum with every lick, suck, and flick of their tongue. And no matter how good they are at it, they may or may not be able to get you there. But fingering...that's something entirely different.
Let's just take a purely psychological look at it first. Sexually, most women need to feel connected to the person they are with (even if only for that moment) in order to truly enjoy sex. Women like to be kissed and touched and held. And those things are very difficult when all you can even see of the guy is the top of his head and occasionally his eyeballs peering out from between your legs (which can be a really bizarre and distracting sight at times). But if the guy is laying beside you, you're all wrapped up in his arms, his lips are traveling all over your neck, your breasts, and of course your lips, and then his fingers start to dance up the inside of your thigh and then up to your soft, wet lips...well, that's just heaven. As the girl, you get to feel safe and loved. When a guy goes down on you, it gets kinda lonely up top sometimes. And personally, I'd rather a guy spend the majority of his time kissing the lips on my face than the ones between my legs. (Not that oral sex isn't amazing at times...I'm just asking you to take another look at an old favorite.)
Do you guys remember the first time you got a girl to fuck you? Do you remember how that happened? I'd be willing to bet that it included a lot of fingering. It's funny that teenage boys know that, but somehow grown men tend to forget it. They just want to skip right over it and get on to 'the real stuff'. Fingering is just the preview before the main attraction, right? Wrong.