As if getting prostate cancer wasn't bad enough, now comes news that a common treatment will shrink your penis, 'significantly'.

Men who receive combination treatment with hormone therapy plus radiation for local or locally advanced prostate cancer may experience a significant reduction in penile length, according to a report in the January issue of the Journal of Urology.

Over 18 months of treatment, the average 'stretched' penis size of a group of participants shrank from 5.6" to only 3.4" inches.