"At first I would simply ask:"
"'On a scale of 1 to 10, how much did you like my lipstick tonight?'"
"But that kind of subjective rating wouldn't lead to a good article, as I wouldn't be able to reproduce the results very well."
"And I noticed several confounding effects of these ratings. For example, he would give higher ratings if I touched his cock more while we kissed. And if I wasn't wearing black lingerie, he would know subliminally that he had little chance to cum that night, and so his ratings would be lower. And worst of all, if I had denied him for several nights in a row, then his ratings would rise steadily until he got to cum. So it was very interesting for me, but it wouldn't lead to a good experiment."