Hi Caballero,
Unless they severed a nerve outside of the testicle area when they did the surgery, having a testicle removed should not cause erectile dysfunction. Your production of sperm might be lighter, and you may experience a drop in libido for a time, but functionally you should be ok.
There are many factors that can cause erectile dysfunction. You can read about
erectile dysfunction here, the basics and what some of the causes
are. The symptoms are
listed here. There is a good section
about coping here that might have some information you find
helpful. Should you be diagnosed with ED, you can read about drugs
commonly prescribed and treatments here.
While online sites are great resources for information to be able to ask all the
right questions when it's time to see your doctor, but they can not take the
place of your doctor's sound medical advice. If you think you are experiencing an issue that is of concern, you should see your doctor.
I hope this helps! Take care and stay in touch and let us know how you are doing!Vicki M