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# Mathematical Model of Mating

In what sounds like a plot of a current television series, scientists have developed a mathematical model of the mating game to help explain why courtship is often protracted.

The study, by researchers at UCL (University College London), University of Warwick and LSE (London School of Economics and Political Science), shows that extended courtship enables a male to signal his suitability to a female and enables the female to screen out the male if he is unsuitable as a mate.

The research, published this month in the Journal of Theoretical Biology, uses game theory to analyze how males and females behave strategically toward each other in the mating game.

The mathematical model considers a male and a female in a courtship encounter of unspecified duration, with the game ending when one or other party quits or the female accepts the male as a mate.

The model assumes that the male is either a ‘‘good’’ or a ‘‘bad’’ type from the female’s point of view, according to his condition or willingness to care for the young after mating.

The female gets a positive payoff from mating if the male is a ‘‘good’’ male but a negative payoff if he is ‘‘bad,’’ so it is in her interest to gain information about the male’s type with the aim of avoiding mating with a “bad” male.

In contrast, a male gets a positive payoff from mating with any female, though his payoff is higher if he is “good” than if he is “bad.”

The study looks for evolutionarily stable equilibrium behaviors, in which females are doing as well as they can against male behavior and males are doing as well as they can against female behavior.

It shows that extended courtship can take place, with a good male being willing to court for longer than a bad male and the female delaying mating. In this way the duration of a male’s courtship effort carries information about his type.

By delaying mating, the female is able to make some use of this information to achieve a degree of screening. Because bad males have a greater tendency to quit the courtship game early, as time goes on and the male has not quit it becomes increasingly probable that he is a “good” male.

Professor Robert Seymour, UCL Mathematics, says: “Courtship in a number of animal species occurs over an extended period of time.

“Human courtship, for example, can involve a sequence of dinners, theatre trips and other outings lasting months or even years.

“One partner — often the male — may pay the greater part of the financial cost, but to both sexes there is a significant cost of time which could be spent on other productive activities. Why don’t people and other animals speed things up to reduce these costs?”

The answer seems to be that longer courtship is a way for the female to acquire information about the male.

“By delaying mating, the female is able to reduce the chance that she will mate with a bad male. A male’s willingness to court for a long time is a signal that he is likely to be a good male.

“Long courtship is a price paid for increasing the chance that mating, if it occurs, will be a harmonious match which benefits both sexes. This may help to explain the commonly held belief that a woman is best advised not to sleep with a man on a first date.”

Source: University College London

Mathematical Model of Mating

#### Rick Nauert PhD

Dr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2018). Mathematical Model of Mating. Psych Central. Retrieved on March 20, 2019, from https://psychcentral.com/news/2009/01/19/mathematical-model-of-mating/3659.html
Last updated: 8 Aug 2018
Last reviewed: By a member of our scientific advisory board on 8 Aug 2018