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SW-User
Voice deepness happens during puberty, but it can't be concluded that having highly deep voice is related to testosterone. Ronnie Coleman has very high pitched voice, but I wouldn't doubt his testosterone levels. He's 8 times bodybuilding mr.olympia.
Science78 · 36-40, M
Then it must also be genetic. Because the thickness of your vocal cords is genetic.
SW-User
It is and with practice voices can be deepened. There are certain exercises that does it. @purecrazy93: