Does penis size matter to women?
No — size matters far less than most men assume. In studies, women's preferred erect length for a long-term partner is about 16.0 cm (6.3 in), only slightly above the 13.1 cm (5.2 in) average, and most women report being satisfied with their partner's size.
Less than most men assume. The cleanest evidence comes from a study where women picked from 3D-printed models (Prause, 2015). For a long-term partner they chose about 6.3 inches (16.0 cm) long and 4.8 inches (12.2 cm) around — a hair above the population average of 5.16 inches (13.12 cm) erect. In other words, the “ideal” they describe is roughly where most men already are.
The same study points to something men tend to skip past: girth carried at least as much weight as length. If you’re going to worry about a dimension, that’s the one with the better case, and it’s the one harder to read off a ruler at a glance.
Two things take the air out of the anxiety. The preference target sits barely above average, so the typical man already clears it. And clinically defined micropenis — under about 3.7 inches (9.3 cm) stretched — affects roughly 0.6% of men, so the fear runs well ahead of the odds. About 90% of men fall between 4.1 and 6.2 inches (10.4–15.9 cm) erect, and a 5-inch erection sits near the 40th percentile, which is to say squarely normal.
Read more on what the research actually says in does size matter and why girth vs length is the better question.
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