DHT hair loss affects both men and women.
DHT stands for Dihydrotestosterone which is the resulting product of direct contact between the enzyme 5-alpha-reductase, found in the skin and the scalp, with the hormone testosterone.
DHT hair loss is caused by the DHT binding to receptor sites on the scalp and hair follicles which interrupts and interacts with the normal chain of events involved in continual healthy hair growth.
To put it another way, DHT hair loss happens when DHT takes over the receptor cell (the cells on the hair follicle that bind to DHT) and sends false signals to the functioning cells responsible for proper hair growth.
Men usually lose hair first in the temporal area, second in the crown, and third, in the vertex or top of the scalp. This is due to the concentration of sweat glands that carry DHT in these areas.
Women on the other hand generally thin in a diffuse manner.