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I have a couple questions about the facial feature differences between the sexes and why those come to be. There seem to be some facial features that only men have.

1) Do women ever get those big square chins and jaws? Obviously there are women with square faces and some with square jaws like Angie Harmon. A square face is not inherently masculine. But I've never seen a woman with a chin/jaw like Kurt Cobain or Jay Leno.

2) do all men have a brow ridge? I've never seen a woman that had one or a man that didn't have one, that I've noticed. Some are very prominent and others are less noticeable but still there.

As a lay person my research has just told me the difference boils down to testosterone but it must be more than that right? Women do not sprout these features from taking testosterone. Even the ones that were doped up for most of their lives like the DDR wrestlers.

Lastly, what causes these features to develop and is there anything that can hinder the development of these features in men? Or to the contrary cause these features to manifest in women?

I have a couple questions about the facial feature differences between the sexes and why those come to be. There seem to be some facial features that only men have. 1) Do women ever get those big square chins and jaws? Obviously there are women with square faces and some with square jaws like Angie Harmon. A square face is not inherently masculine. But I've never seen a woman with a chin/jaw like Kurt Cobain or Jay Leno. 2) do all men have a brow ridge? I've never seen a woman that had one or a man that didn't have one, that I've noticed. Some are very prominent and others are less noticeable but still there. As a lay person my research has just told me the difference boils down to testosterone but it must be more than that right? Women do not sprout these features from taking testosterone. Even the ones that were doped up for most of their lives like the DDR wrestlers. Lastly, what causes these features to develop and is there anything that can hinder the development of these features in men? Or to the contrary cause these features to manifest in women?

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I found this article. https://www.abc.net.au/news/science/2015-09-23/masculine-face-linked-to-testosterone-levels-in-womb/6795422

Which is from this study https://royalsocietypublishing.org/doi/10.1098/rspb.2015.1351

Professor Whitehouse and his colleagues analysed 97 males and 86 females, whose umbilical cord blood had been collected as part of the study.

They measured the testosterone levels in the cord blood a well as at other times during the study.

Once the children had reached the age of 21 to 24 years, the researchers then checked to see how masculine their faces were.

"Higher levels of testosterone in the cord blood are actually related to more masculine facial features," Professor Whitehouse said.

"That holds within sexes as well," he added. "So if we look at just females we find that females with more testosterone have more masculine features as well."

Previous research has found that testosterone levels during puberty determine how masculine and feminine you look, but Professor Whitehouse said levels in the womb were more important.

"We tested pubertal hormone levels as well, and found that it was the prenatal levels that were more related to adult facial structure," he said.