Cock Block

File this under the charmed physiological lives of men: Dudes may be able to protect themselves from contracting HIV by rubbing some cream on their dick heads. Dr. Andrew Pask, an Australian zoologist at the University of Melbourne, has discovered that rubbing topical estrogen on the tip of the penis "could induce a thickening of the keratin layer of the foreskin epidermis." Keratin acts as a barrier for viral infections, thus preventing the spread of the disease. [Science Daily via Boing Boing]