There are enough myths on this topic: from it does not matter at all to "size is everything." To understand how it really is, you need to know how a woman physiologically gets an orgasm. And look at the research statistics.
All the myths about the importance or not the importance of the size of manhood revolve around the vaginal orgasm. But the fact is that the vaginal orgasm is also a myth. The female vagina is almost not innervated, otherwise it would be impossible to give birth. Orgasm requires great nervous sensitivity.
Women who say they have had a vaginal orgasm are not lying: they simply do not know how the physiology of their orgasm works - not the vagina, but the clitoris plays the key role in it.
Physiology
The clitoris is usually the small organ above the labia minora. For a very long time it was believed that this small organ is the entire clitoris. Research has shown that this is not the case.
In the external genital organs of a woman, only the head of the clitoris is located, and it itself is hidden inside. And this is not a small organ at all - it covers the entire area above the external genitals.
The clitoris consists of a head that can be seen, two legs and two bulbs that are hidden inside. It is created from the corpus cavernosum, just like the male penis. The bulbs of the clitoris "clasp" the vagina, and during vaginal sex they are stimulated, from which orgasm occurs.
That is, a female orgasm is always from the clitoris, but it can be obtained in different ways, stimulating different parts of it. And when it comes to vaginal sex, what matters is not the size of the penis in general, but its volume: the thicker, the more intense the effect on the clitoris.
Physiologically, yes, the thickness of the penis can make a difference. But it may not, because all women are different, and they need different stimulation too. This is clearly reflected in the statistics.
Statistics
Research was conducted at the Australian National University in Canberra and at the University of California. In both cases, women of different ages were interviewed.
According to an Australian study, women prefer men with larger than average penis sizes. The average is 12, 8-14, 2 cm in a non-erect state. However, if the size is significantly higher than the average, women no longer like it and even repulse them.
In a California study, only 9% of women surveyed said penis size was important. 67% said it didn't matter.