well i just finished my treatment and i am really nervous because, i heard that one side affect for men is not being able to have erections. I did about a year of chemo, with also radiation and i am scared that this side affect may happen to me. Does anyone out there know if this is true or false?

Depends on the type of chemo and what part of the body was radiated.

Don't worry about sex. It will be the least thing on your mind for a while. Eventually it should come back, but for now focus on more important stuff, like survival.