This idea establishes a causal relationship between the two variables analyzed. Causality states that the ocurrence of one event is the result of another. Hence, the sencond is the cause of the first.
In order to arrive to this conclusion, Dr. Masterson, should have conducted a regression-type statistical analysis, to determine that the regressor or independent variable (exposure to sexual consent) produces a causal effect on the dependent variable (sexual behaviour).
Causality is usually claimed attached to a certain probability: "it is more likely". This is why the underlying analysis should have been quantitative.