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Why the Penis Gets Bigger During an Erection
If, according to an old urologists' saying, "5 cm is enough for reproduction", then a penis shouldn't need to get any bigger during an erection at all, since the average penis is already 8.3 cm long in the flaccid state. That has always been the problem with this statement – born of patriarchy and the desire to suppress female sexuality: the penis would, by that logic, actually have to get smaller to reach 5 cm. Yet no penis gets smaller during an erection. This urologists' saying was nothing more than a disparaging remark.
So many men wonder why their penis becomes noticeably bigger during an erection. The answer is simple – and sensible: the body ensures that semen reaches as deep as possible into the woman during intercourse. This increases the chances of pregnancy. In this article, we explain why that is the case – and why women often unconsciously prefer men with a larger penis.
The Erection – a Natural Reproductive Mechanism
When a man is sexually aroused, his penis receives a strong supply of blood. It becomes hard, longer, and thicker – this is called an erection. This change serves a clear purpose: it enables sexual intercourse and ensures that semen reaches deep into the vagina – closer to the uterus. This increases the likelihood of fertilization. The erection is therefore part of the body's natural reproductive system.
Deeper Penetration, Better Fertilization
The enlargement of the penis during erection is no accident. It helps carry semen further inward. The deeper the semen is placed, the closer it is to the egg – and the greater the chance of fertilization. Nature has therefore shaped the penis in exactly the way that makes it as effective as possible for reproduction.
Women Know This – Quite Instinctively
What is fascinating is that many women unconsciously perceive this biological connection. Studies show that women find men with a larger penis sexually more attractive. A well-known study by the Australian National University found that penis size – together with height and shoulder width – plays a role in partner selection. The scientific journal PNAS (Proceedings of the National Academy of Sciences) also confirms this: women prefer larger penises because they associate them with better sexual experiences and higher fertility. These preferences are often unconscious, but they show that evolution still plays a role in partner selection today.
It's About Function – Not Beauty
Many people think the penis is about appearance. In reality, however, its function is what matters. The penis is a tool of reproduction. The fact that it gets bigger during an erection has nothing to do with aesthetics – it's about effectiveness. And that is exactly what many women recognise, even if they couldn't consciously explain it.
The penis becomes bigger during an erection so that semen can be delivered deeper into the vagina – making pregnancy more likely. Women instinctively perceive this connection and therefore often prefer men with a larger penis. Understanding this can help you better understand your own body – without any shame, but with respect for nature.
