Would you like your jerk buddy to ejaculate before you so you can have his sperm in your mouth to finish your own wank and cum you turn? YES
Do like to watch yourself in the mirror when you masturbate? YES
Would you like to be able to ejaculate twice in a row so you can masturbate with your own sperm the second time? YES
In a MMF fuck, it's better to let the other guy finish first so you can then fill the sloppy second cummed pussy? NO
Aren't you a little disappointed when you click on somebody and all their pics are pretty much the exact same thing over and over again? NO