Its very nice that you have successfully got treted of colon cancer
. It would have been better if you had mentioned what was the location of your cancer in the colon - like was it proximal colon or distal rectal cancer
. Also whether radiotherapy was used or not. Because radiotherapy may cause sexual problems after a year of treatment completion. Sometimes because of surgery or chemotherapy
may cause some problem. The exact type of problem - whether psychological, erectile or ejaculatory dysfunction has to be quantified and qualified for proper treatment. Its better you visit your treating surgeon and also a urologist
. All the best.
Dr. Mohammed Ibrahim