A study of guppy fish shows that a male guppy will alter its courting patterns in response to feedback from a female guppy. Males with more orange on one side than the other were free to vary which side they showed to a female. Females were drawn to those males with more orange showing, and males tended to show the females their more orange side when courting.
No studies have been done on whether male guppies with more orange coloring father more offspring than those with less orange coloring provides the most support for the argument.