Maybe not, because of the "excitement" factor -- something that might influence the amount of seminal fluid ejaculated by the prostate.
Just a theory, however. Not speaking from any personal experience!
Normal ejaculation produces about 3 – 5 cc (teaspoon) of semen.. The sperm makes up less than 1% of this volume with the seminal vesicles and the prostate producing the remainder of the volume. The prostate, which is made up of thousands of fluid-producing glands, itself secretes 25 – 35% of the total fluid volume. It is during high arousal in particular, that the prostate secretes this fluid. If extended arousal is not followed by ejaculation, the prostate can become tender and somewhat sore. This condition seems to account for what some call “blue balls”.