For men who have had external beam radiotherapy (EBRT) for prostate cancer, the greatest decline in sexual function is in the first 24 months post-treatment, with no significant changes thereafter, according to a report in the International Journal of Radiation Oncology, Biology, Physics (2010;76:31-35).

In 143 men followed for up to eight years (median four years), the only statistically significant reductions in sexual function occurred in the initial 24-month after treatment.

Function stabilized after that point, with no further statistically significant change noted in any area including sex drive, erectile function, ejaculatory function, and overall satisfaction.

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