directly proportional 

immediately the relation of one thing to another in size degree or amount

girl: your smexxiness is directly proportional to the number of tatoos you have
boy: really??? i'm going to get another..
girl: heeeyyyy...

your level of hotness is directly proportional to how little clothing you have on...and how big your boots are

directly proportional by nina & 'lissa March 25, 2007

Directly proportional 

A mathematical relationship between two things that can be given by the equation y = kx, where k is a constant value.
In other words, when one object increases, another increases by the same amount.

The chance of toast hitting the buttered side-up is directly proportional to the cost of the carpet.

Directly proportional by Mickey_G_ February 26, 2021