Not directly: There are no known reasons why brain trauma in general, should affect sperm count (unless the hormone influencing parts of the brain were damaged--but these are very deep inside). Yet what you described is reported. It's possible there's an indirect effect on hormones via the emotionally traumatic dimension of tbi, so, how long? It's a guess, but maybe until he is emotionally more healed.
Answered 4/12/2017
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