Flirt Hard, Die Young

The more these birds do their mating display (above — it gets real around 0:45), the faster they lose their virility.

Over the age of six years they began to produce much smaller ejaculates with immobile and frequently abnormal sperm. … But the key finding was that males that had invested most effort displaying to females in their earlier years experienced the onset of this age-related decline in fertility at a younger age. They effectively seem to “burn themselves out” sooner.

What does this mean for people? As a Daily Mail commenter explains, “Theres something in this, I know this woman whos 38 & a constant flirt, She would pass for 50 easily.”