ScienceDaily (Jan. 6, 2010) — Sexual function in prostate cancer patients receiving external beam radiation therapy (EBRT) decreases within the first two years after treatment but then stabilizes and does not continuously decline as was previously thought, according to a study in the January 1 issue of the International Journal of Radiation Oncology*Biology*Physics, the official journal of the American Society for Radiation Oncology (ASTRO).