What causes women to get breast cancer more often than men? is it because of cosmetics?

Not cosmetic: Women have many more active cells in their breast tissue resposible for milk production. All of these cells respond and change to the monthly hormonal changes that a woman experiences all the way from their first menstrual cycle as a teenager to menopause. Breast cancer most commonly forms in these active cells of the milk ducts or lobules. These breast tissue cells are much less prominent in men.