What can i do to please in sex, and does size really matter ?

The average length of a man is 5.1 inches to 5.7 inches, with an average girth (circumference when erect): from 3.5 inches to 3.9 inches. Ansel Research Lifestyles 2001 study on penis size: Ansell, makers of LifeStyles Condoms, has conducted research into average penis size. The survey found that the average length of the erect penis is 5.877 inches (14.928cm), with the majority ranging between the small 5.5 inch penis size (14cm) and the large 6.3 inch penises (16cm).

The average girth is 4.972 inches (12.63cm), with the majority ranging between 4.7 inches (12cm) and 5.1 inches (13cm). This indicates that the difference between small penis size and large is not very big. I had to grow up with the nearly one inch of self reporting bias: all of the original studies before say 1990 suffered from allowing guys to self report the size of their penis. The guys with larger penises tended to report their sizes and even then added an inch on the average to their actual size. 

There is no way to safely and reliably increase the size of your penis. But if I were you I would not want a large one as noted later. 

A key to good sex is match because vagina sizes vary just as penis sizes vary. Length of the average unaroused vagina according to several textbooks I've read, the length of the vagina should be 3-4 inches long (7-10cm) (ref: Tim Chard, Basic Sciences for Obstetrics and Gynecology)Golfcrazie 03:32, 23 August 2007 (UTC)

Other studies and articles I've read the unaroused and unpenetrated vagina is from 2-4 inches long (3" on average). Measurements are slightly different depending on whether you're measuring across the anterior or posterior wall, and position women is in (e.g. sitting, standing, etc...). (Comment: if 3" and increases 100% that gives only 6" max (but showers/growers may apply here and that being smaller vaginas may be able to increase a bit more percentage wise than large ones; clearly a 6-7" capacity would easily accommodate the average penis). But the average vagina may be stretched (and I do not mean permanently) by a large penis causing perhaps for the very beginning a "desirable feeling of fullness" but quickly becoming sore during even the regular duration of intercourse. Very large ones can hardly get it in without difficulty. Then women get real mad when you hit the cervix. And the news is out there are more complaints about the large penises than the small ones.

As one lady put it: "If the guy is big enough and I’m small enough that it friggin’ HURTS, then YES IT [SIZE] DOES MATTER!!! Then this guy says he likes loose vaginas (I was shocked the first time I had sex at how difficult it was to get it in there! I actually hurt myself trying to force it in. I hate it when they’re tight. I can feel their pubic bone jutting into my penis and it is very uncomfortable. Plus when they’re tight, it feels like someone is trying to crush my penis. The loose ones are nice and comfortable...I’m too big for most.

In other words, an average woman may want to briefly experiment with a larger than average penis, but when she chooses a mate to live with on a daily basis, she usually chooses an average guy. So successful sex does not depend on just your size. You goal is to find a female you match well with. You might have problems with a female who has a real small vagina or with one that has a large vagaina: she might say you are small but this is just from her point of view. You will be just fine with the wide range of average women. Both men and women are about 70% average more or less.

But that is just the physical side of sex. Successful sexual relations are much more complex. There is confidence. The female requires a degree of confidence about their males. Their job is to relax themselves so they can orgasm. They don't want to have to be concerned that you feel like you are too small or too stressed to focus on them. 

Then there is technique. Women will notice right away if you have some knowledge of good techniques of sex. Enjoy her whole body: the feel and smells. In my book, technique rule no. 1 is called the ICS rule: it's the clitoris stupid. Most women do not obtain an orgasm via vaginal intercourse; and fewer younger one do before their thirties. therefore, ask her how she likes her clitoris manipulated? The tongue works wonders on the clitoris which is just above the entry to the vagina and is extremely sensitive to touch and pressure. And be careful not to rub her thighs or public area with sharp wiskers (i.e. shave well and don't rub you chin or face hard against her skin down there) The second rule is ladies first. Get your gal off first with a clitorial climax and then she will be pleased to let you climax. Now there is far more to sexual technique than I can cover here, but you have a few decades to learn and perfect your techniques. Go slow and careful and safe and enjoy yourself and your ladies. Remember you may have to kiss a couple of frogs before you find the real princess. 

Finally, there is the enrichment of emotional, spiritual, and even sexual attractions that are there or not there in the process and women and men notice their absence. Hope this helps you.