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Pain in the buttocks after ejaculation is usually due to a prostrate problem.
During ejaculation, the the prostate contracts, pushing semen through the urethra at speed. If the prostrate is infected (prostatitis), you may get pain in the penis as well as the buttocks.
Please consult a urologist for a checkup.
If you have a pain that travels up your legs to the buttocks and which mostly occurs when you are siting, it is likely to be due to Sciatica - inflammation of the Sciatic nerve.
Please consult a neurologist.
A neurological consultation would be best to come to a diagnosis.
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