Our expert says:
I don't think any proper treatment for diabetes ought to afect his sexual drive / libido, but untreated diabetes, and even to a lesser extent treated diabetes can affect him especially with regards to the erection. I understand that Viagra may be able to help in such cases, but it's awfully expensive, and he would have to check with his doctor as to whether it would be safe in his case. If he has just started treatment, there is also a fair possibility that this will improve as he responds further to the treatment.
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