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Dallas since Married at First Sight since In mammals, the hormones that influence sexual differentiation and development are androgens mainly testosterone , which stimulate later development of the ovary. Males Men Gender Sex. The SRY gene on the Y chromosome , however, interferes with the default process, causing a chain of events that, all things being equal, leads to testes formation, androgen production, and a range of both pre-natal and post-natal hormonal effects covered by the terms masculinization or virilization. For humans in general, see Human.