this can be just psychological, this is pretty common in times of stress, or in new relationships. this makes sense with the fact that he is okay with self stim. medical reasons can be simply ruled out with some tests of his hormone levels: testosterone (free and total), prolactin, and DHEA. other possibilities can be blood vessel or nerve related, seen in neuromuscular disorder and htn or diabetes. he should get a complete physical to rule out the above. the fact that hes okay with masturbation doesnt necesarrily rule these out.
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