|A visual depiction of Beckhap's law, which says that beauty (physical attractiveness) is inversely proportional, on average, to brains (intellect). In 2002, American electrochemical engineer Libb Thims collected data on actual "beauty" and "brains" estimates of the 1969 to 1972 graduating classes of the University of Illinois, Chicago, giving quantitative proof to the colloquial folklore legend.|
|Female | Examples||Male | Examples|
| 7 |
|Top: more physically attractive females, attractiveness scores of 7, who obtained easier degrees in: elementary education and English.|
Bottom: lesser physically attractiveness females, attractiveness scores of 1, who obtained harder degrees in: German, anthropology, history, and sociology.
|Top: a more physically attractive male, attractiveness score of 7, who obtained an intellectually easier degree of communications.|
Bottom: lesser physically attractive males, attractiveness scores of 1, who obtained harder degrees in: psychology, history, computer science, and chemical engineering.
See main: College degrees by intellectual difficultyThe following shows the ranking of “intellectual difficulty” (I), on a scale of 1-100 (100=harder, 0=easier), of the 90 attained degrees for female graduating students of the University of Illinois, Chicago, for the graduating classes of 1969 and 1970 combined, according to the polled opinion of American college students (N=14). 
Description: A plot of the ranked data results, of the group "female science majors", from the 2002 study of 2,018 University of Illinois at Chicago (UIC) college graduation photos, graduating classes of 1969 and 1972, showing that attractiveness is inversely proportion, on average, to intelligence, a finding which corroborates Beckhap's law.
Key: P = psychology, B = biology, C = chemistry, and M = mathematics, each with 41, 20, 13, and 21 students, respectively. Similarly, A = physical attractiveness (of group); on a scale of 7.0 = most physically attractive to 1.0 = least physically attractive; and I = intellectual difficulty (of degree); on a scale of 100 = most intellectually difficult to 10 = least intellectually difficult.
See main: Human chemical thermodynamicsThims then attempted to explain this finding by correlating the initial state Gi and final state Gf of the free energy change for a typical mating reaction to bulk values of attractiveness and intelligence involved in mate selection. A solution was found using the following two assumptions, first that enthalpy is proportional to physical attractiveness:
This would concur, in some sense, with Frederick Rossini's 1971 "Chemical Thermodynamics in the Real World" argument that enthalpy is a measure of "security" in social reaction existence, meaning that people will tend to want to bond with physically attractive individuals in relationships, and hence be seemingly more "secure" in their social existence or in the social structure, whereas less physically attractive individuals will tend to remain single, e.g. homebodies, cat ladies, and or outcasts, e.g. hobos, bag ladies, etc., give or take, baring more detailed discussion.
Gibbs free energy of the state of the child, Bc, detached at age 15. Gibbs free energy of the state of two reactants, the male Mx and female molecule Fy, at the point of love at first sight. Enthalpy of the state of the child, Bc, detached at age 15. Enthalpy of the state of the two reactants, the male Mx and female molecule Fy, at the point of love at first sight. Entropy of the state of the child, Bc, detached at age 15. Entropy of of the state of the two reactants, the male Mx and female molecule Fy, at the point of love at first sight.