This is Dr. David. I am reviewing your question now and will be with you momentarily.
you could be having enlargement of your prostate gland.
an enlarged prostate gland or infected prostate gland can cause difficulty emptying your bladder completely
having sex can sometimes cause temporary swelling of your prostate gland, but usually it doesn't change the size of your prostate gland that much.
most likely you are not causing worsening of your situation by having sex.
you can obtain from sex, but you don't have to.
let me know if you have other questions.