"Although the numbers of men and women experience hair loss or thinning hair is roughly equal"
I call bullshit.
If you mean women who have thinning that is hardly noticeable, I can agree, but that is what making hair shorter and thickeners are for. The end result? You do not notice the woman's losing any hair. Maybe until her late 40s or 50s but like she should care then. No one wants to bang a 45 year old woman anyway.
About this sebum thing, I disagree to that as well. Hair loss is not caused because you sweat more from your head. If that was the case than every person with a full head of hair would be balding if they were to never wash their head. They can leave sebum building up in their scalp continuously for years and they would not thin, ever. Why the hell do you think cavemen didn't bald?
Sebum may be a factor accelerating your already-determined-pattern of balding but it will never be a root cause. This goes in the category of stress and frequent masturbation.