субота, 29. септембар 2012.

Deep-Voiced Men Have Lower Sperm Counts, Study Says.
 The theory is that these traits signal a high-quality mate—for instance, it's been proposed that masculine men generally have more robust amounts of sperm.
 But the new research revealed that, while deep voices are attractive to women, low-pitched men actually tended to have lower concentrations of sperm in their ejaculate.
(Find out how a man produces 1,500 sperm a second.)
The finding suggests that men who evolutionarily invest most of their energy into making themselves attractive to females may suffer deficiencies in other areas—in this case, sperm counts.
For instance, the male hormone testosterone—which lowers voice pitch—can thwart sperm production, according to study leader Leigh Simmons, an evolutionary biologist at the University of Western Australia.

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