We can write the dating rule as an equation: $y=x \div 2 7$.
In this equation, $x$ is your age and $y$ is the minimum age you are supposed to date. Well, it means we can work out some other implications of the rule.
Men with bald heads, for example, should not wear a hat to cover their pate as their lack of hair will be attractive to some.
Those who are overweight should also not use clever photo cropping to hide what they perceive as flaws.
The idea is that if there are two women - A and B - who men rank as being equally attractive, if a third woman comes along who looks like a less attractive version of woman A, then woman A becomes more popular with the men.
Being unconventionally attractive may also be an advantage, according to the mathematician's research.
There is a so-called rule about dating: the youngest age you are supposed to date is half your age plus seven.