Speed and effectiveness of sperm and ejaculation of more or less semen during copulations depends on the attractiveness of a female — says a new study. According to the study conducted by researchers at University College London (UCL) and the University of Oxford, the chances of fertilization become more in promiscuous species, when males copulate with attractive females.

The study articulates that males release seminal fluids more in quantity and effectiveness while copulating with attractive females. The study also reveals that attractive males release fewer sperm per mating against unattractive males, and attractive males could be less fertile than unattractive males.

In the study report published in the Proceedings of the Royal Society B, the study co-authors Dr. Charlie Cornwallis, of the University of Oxford, and Dr Emily O'Connor of the Royal Veterinary College, say, "Female attractiveness is determined by the expression of a sexual ornament - the comb - which is phenotypically and genetically correlated to the number and mass of eggs females lay.”

The study report says that the researchers collected and studied natural ejaculates from dominate and subordinate red junglefowl males housed at the University of Stockholm. Cornwallis and O''Connor write that there was a strong relationship between female attractiveness and sperm velocity and the volume of the sperm ejaculation; males ejaculate larger sperm in attractive females.