Non-independent mate-choice, one of the driving forces of sexual selection (a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with) and the evolution of male traits, is when a female's sexual preferences get socially inclined toward those of its fellow female.
Mate-choice copying, or non-independent mate choice, is simply when a female of an animal species copies another fellow female's mate-choice. In other words, non-independent mate-choice is when a female's sexual preferences get socially inclined toward those of its fellow female. This behavior is speculated to be one of the driving forces of sexual selection and the evolution of male traits. Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual selection). 
