Hi--it appears Dr. Gupta is away, so JA Admin has allowed me to answer you.
What you have is called:
Male Erectile Dysfunction [MED].
Here's a helpful link, which lists the potential causes:
http://www.urologychannel.com/erectiledysfunction/
Most common causes:
- Vascular dz
- Diabetes
- Hormonal deficiency
- Radiation tx
- Chemotx
- Psychogenic
In your case, residual effects from the rad tx & chemo are likely to be factors. You shoud also see a doctor to get tested for: Diabetes; and Testosterone deficiency; both can be treated.
Finally--you are a great candidate for treatment with: Viagra; Levitra; or Cialis. Any one of these 3 prescription meds should enable you to achieve FULL erection during sex, until orgasm is achieved. Pls talk to your MD about getting an RX for this, if he feels you are a safe candidate.
Good luck.
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(feel free to ask a followup Q, if needed)
Best Wishes for Your Health,
--Dr. Steve, (Your Online Family Doctor)
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Info given herein is general health info, and NOT a substitute for needed M.D. attention