Actually the "exaggerated" facial features (eg sloping forehead, brow ridge, wide set eyes, square jaw, etc) could be coming from hormones, genetics, diet and exercise, and not all men have exaggerated facial features. Yes it's common in men to have these facial features due to testosterone but some women who exercised, ate healthy or even dieted during childhood would look like they have "male" skulls. Most likely the women who exercised at a young age would look like they have male skulls. People with less exaggerated facial features tend to exercise less during childhood. I didn't exercise that much when i was young and as a bio female i tend to have a oval female skull, and I'm small boned like some women. I've seen and met a lot of bio females in real life with more exaggerated and larger facial features, but it's not 100% true for female celebrities, since some (idk if all) female celebrities might be MTFs. This is my theory. Skull shape comes from childhood lifestyle and hormones.