Adults-Only Guessing Game

Guess what this doctor is talking about:

"Patients tell me afterwards they are more confident and comfortable,'' Rho said. "Some patients say having a sleeker, thinner ______ makes a tremendous difference in their lives.''

Hint: the missing word is something that won't make it through many spam filters. Hence I will not be more specific. Click here to see the answer.

I would love to read comments about this new and exciting medical breakthrough. Please tell me what you think.