Emery Boards Alarm My Penis

From the final paragraph of today's New York Times article on the cervical cancer vaccine:

Merck had originally hoped to get the vaccine approved for use in boys. But although women have routinely allowed swabs to be taken of their vaginal cells, the company found that men rebelled against the use of emery boards to collect cells from their penises. Researchers eventually discovered that jeweler's-grade emery paper effectively removed cells without alarming men and were able to complete their studies.