DHT in Sebum

I think its been scientifically proven that sebum contains DHT. Based on that fact I have a few questions

1. Can you explain the difference of DHT in sebum vs. the DHT that causes MPB is genetically senstive follicles and why DHT in sebum would not cause MPB? Im asking because I was the one who posted about worries of not washing my hair/scalp consistantly, could have caused hairloss. Its possible in a 4yr period I went up to a month w/o washing my hair with shampoo, although I did take a shower daily, so the hair/scalp did get wet.
2. Also I have a fairly hairy body and was wondering since I really only washed my face consistantly because of compulsions namely acne on my face,by not washing away sebum on my body caused more hair growth that I would had experienced if I washed myself well during this time? Im using the basic concept that DHT promotes hair growth on the body and hairloss on the head.
3. Finally is there a definitive correaltion between hairy body and MPB? I was wondering because you always talk about the differences between maturing hairlines and actual MPB, would it then be your recommendation to males to wait taking propecia or any other med for MPB until you see definite thinning on the crown and vertex vs just some recession and minuaturization along the hairline?
4. How common is it to see males have really prominate recession (NW2-2.5) in their 20’s but then just stabilize and not have any thinning on the vertex and crown? I think of Bush Sr. if you pull up a pic of him in his 20’s, he had definitive recession but then it just stablized and now about 50 yrs later, he basically has the same hair although alittle thinner due to aging.

Your post is a bit troubling to me.

How did you go four years with only washing your hair maybe once a month with shampoo? That sounds like a hygene issue.

I believe your logic is a bit flawed. Male pattern balding is associated with DHT, but DHT is NOT the only cause of male pattern balding. In other words, just because it is cloudy on a rainy day does not mean it will rain if it is cloudy. Thus, DHT is only part of the puzzle in the cause of male pattern balding. That is why finasteride (Propecia) does not always work on all patients. The cause of male pattern balding in its entirety is still not completely understood.

I do not believe there is any scientific proof that DHT in sebum is the cause of hair loss. Even if was true, it would not be the ONLY factor in hair loss. Thus the basis of your following questions is subject to a false assumption (sorry).

The difference between a maturing hairline (normal) and receding hairline (male pattern balding) has to do with the location of the recession and how far the recession goes with respect to basic proportion of an individual’s face. Keep in mind that everybody’s face is unique and there are subtle variations. To be more scientific (for an individual case) more detailed examinations (including a miniaturization study) and a complete history of the hair recession would be appropriate.

Increased body hair does not correlate well with MPB.