What are the proportions or measurements of where an attractive hairline begins for females?

There seems to be ideal measurements for eyebrow length and placement but are there also measurements for where an ideal hairline begins? I've read that a feminine hairline angles forward towards the forehead from the temples on the sides and a masculine one angles the opposite direction. I'd like to know more about the measurements of the hairline relative to the nose, eyes or other facial landmarks. Thank you.