Size does matter.

Also from this month's Popular Science:

The scientists found that female mosquitofish prefer the well-endowed male. Unfortunately for the males, larger genitalia impede a speedy getaway, making them more likely to be eaten by predators. Sometimes, you just can’t win.

Yeah, I've got that problem too. I'm ALWAYS tripping over it when being chased by predators.

And FYI, PopSci, about 10% of the MALE mosquitofish also prefer the well-endowed male. And 10% of the female mosquitofish wear flannel and work as welders or truck drivers.