(Before It's News)
Howler monkeys have low sexy calls or big balls, but not both. While this research “has no practical application to human mate choice … some research has suggested that men with deep voices have more sex partners, and therefore more opportunities to reproduce. But another study showed lower sperm quality in deeper-voiced men.” Oh wouldn't it be nice if … or would it?
Source:
https://www.psychologytoday.com/blog/animal-emotions/201510/howler-monkeys-have-deep-voice-or-big-balls-not-both