In this context papilla refers to the projection created by the tumor, not a tumor on an already existing papilla (such as the nipple).

The minute droplets of fluid were once believed to be important for lubricating the vagina, but research from Masters and Johnson demonstrated that vaginal lubrication comes from deeper within the vagina.

Maybe a coming of age in the American sensual darkness, never seeing an unsmudged nipple, an uncensored vagina, has left me forever infected with an unquenchable lust of the eye.

And, because much of the risk is borne by banks (rather than by, say, hedge funds), which play a central role in lubricating the payments system, a sovereign debt crisis can cause widespread harm.

Researchers take advantage of this fact by rigging up two rubber nipples, so that if a baby sucks on one, it hears a recording of its mother's voice on a pair of headphones, and if it sucks on the other nipple, it hears a recording of a female stranger's voice.