Final answer:
The response of males to the t-shirt study on estrous was measured using penile plethysmography, an objective measurement of sexual arousal.
Step-by-step explanation:
The response of males to the t-shirt study on estrous aligns with findings from other research into sexual arousal and physiological responses. In such studies, male sexual arousal is often objectively measured using instruments like a penile plethysmograph, which assess changes in blood flow to the p*nis. For example, in one particular study, male participants were shown various sexually explicit videos, and changes in penile tumescence were recorded.