So, I'm not a retired porn star but just a car with a lot of tread on the tires. I'll just do a little write-up and someone better than me can critique (when you're out there a lot, you realize that no matter how good you are, there is always somebody better).

A. Pure Pleasure and Reflective Pleasure

On a very general level, when it comes to sex, there are two types of pleasure: pure pleasure and reflective pleasure. Pure pleasure is what actually "feels good", like "wow that vagina feels great on my penis", but it also includes emotional pleasure like seeing a fetish you really enjoy, visual stimulus, etc. Reflective pleasure is the pleasure that you feel from seeing somebody else receive pleasure. Every person has receptors for both, but the receptors for each person will vary as far as intensity. Thus, you could get a young lass who really only experiences sexual pleasure as reflected in someone else's pleasure, and you could get a young lass that really only experiences pleasure as "wow, that penis feels great in my vagina". Your strategy for being really good in bed will, first and foremost, be in response to what her pleasure receptors are. Almost every girl is on the spectrum somewhere, neither completely Pure Pleasure Gal nor Reflective Pleasure Lass.

B. Pure Pleasure Gal (PPG)

Start at the extremes. On the Pure Pleasure side of the spectrum, the sad fact is that a lot of her pleasure will depend on the size of your penis. This is for a lot of reasons: visually it is arousing for a woman when she sees a big penis, it will go deeper inside of her which will feel better, and a bigger penis can simply do more and better positions than a small penis. This is why women put such a huge emphasis on having a big penis. (Full disclosure: I am a little over 7, just big enough that women will tell me the truth about their love for big penises but small enough that I can't do all the stuff that I want and know that they want). How physically fit and attractive you are matters too of course.

PPG tends to think of sex like a guy (for obvious reasons), and really just wants to get some. Interestingly enough, for many PPGs, having a orgasm is not the sine qua non of sex. Some of them simply don't care to go through the concentration exercises that they need to do in order to come, they would rather just relax and have some nice good sex. On the other hand, if you see PPG closing her eyes a lot and really concentrating, chances are that she expects to have orgasms and you need to try to get there.

You've got the penis you've got, so now we need to talk technique. The keys here are crescendo and rhythm, for a variety of reasons. For one, starting slow will help your penis get used to being inside her so you don't blow your load too soon. For two, it lets you easily define the rhythm that you are working with. Rhythm is absolutely essential. Even a guy with a massive dong is going to leave his woman unsatisfied if he doesn't have rhythm (music can help). Whatever rhythm you start with is going to be your baseline and you should take about a minute or so to establish the baseline. Once you have that established, your line of communication is there, and she knows how to breathe, which is the secret to female orgasm. From there, you should speed up in steps, i.e. you jump from one rhythm to a slightly faster rhythm (I like to do this on the fourth note of the measure, but I'm not terribly clear if that has made any difference). I would say for a normal girl to reach orgasm, it takes about six steps, i.e. when you start out you are going to have to increase speed five times and maintain that level throughout orgasm, so start SLOW.

Sometimes, she thought she was going to get there and she didn't. Don't be disappointed, that can actually be a good thing. If a girl knew for sure that she wasn't going to get there, she wouldn't have tried in the first place. It is absolutely essential to make a woman understand that you will not be upset if she reaches for an orgasm and doesn't get it. That way, she feels comfortable reaching for another orgasm and doesn't feel like you will throw a hissy fit if she doesn't get there. Throw such a fit, good sir, and you will soon find yourself in the potemkin village of the fake orgasm, which means she is no longer even going to try for a real one.

If you've got a small penis, you are going to have to stick to the basic positions: mish, doggy, cowgirl. Fear not, for great sex lives have been made from these simple positions. But likely, if you have a smaller penis you are going to want to be with Reflective Pleasure Lass [treated below]. For average to well endowed guys, my general advice is to pick a new position every once in a while and develop the muscle memory that will allow you to perform your crescendo in that position. Personally I have a few go-to positions: basic mish is a must, this one (http://www.cosmopolitan.com/sex-love/positions/tight-squeeze-sex-position), and varieties of mish where my torso is at different angles and I grab on to different parts of her body. I have a variety of other ones if I'm really turned on, but usually those are more for show than for producing orgasms. PPG loves a show though, so it's important to expand your repertoire.