Latest studies from the University of Texas, Louisiana State University Health Sciences Center, and the Smithsonian Tropical Research Institute show that "female cognitive ability can limit how melodious or handsome males become over evolutionary time" (Akre 2011). Males naturally try to improve their skills and appearance...even more aggressively if their is competition for a female.
Since the dawn of time, males have been trying to get our attention with the bigger and the better. In the animal world, we commonly see a spectacular show of colors, dancing, and song. The male does a lot of work to get attention, but the stand-out usually wins the very desirable prize of creating more offspring. However, the fancier these shows get, it seems the more difficult for females to recognize and detect...especially in song.
The male Tungara Frogs of Panama have made good use of their vocal abilities over time, wooing females with a series of "whines" and "chucks". Studies show that female Tungaras prefer the calls with many "chucks", so males have gradually started adding more "chucks". This addition of chucks has proven to decrease predatory advance on the frogs (which is always a plus!), BUT it started to confuse the females. So many noises...which frog to choose...and is that even a frog?? After several failed attempts with the extra chucks, the males went back to the basics.
Its a very interesting thing, since all the exciting, bright, flamboyant showiness comes with such a price. It frequently draws more predators in. So, when it was found that a higher number of chucks decreases this danger, you would think the frogs would go for it. Nevertheless, the risk of losing out on the female is one that these little frogs are NOT willing to take. A very common thing in the animal world if you take a close look...for animals to choose mating over potential demise.
Women...always creating ultimatums. But hey, at least this shows you don't need to work TOO hard fellas, we are pretty simple creatures. Most of the time. (muahaha) :-D
K. L. Akre, H. E. Farris, A. M. Lea, R. A. Page, M. J. Ryan. Signal Perception in Frogs and Bats and the Evolution of Mating Signals. Science, 2011; 333 (6043): 751 DOI: 10.1126/science.1205623