When two males stand face to face, looking in each other’s eyes,
mush the heads of their fully-erect penis’s together. One male (usually a submissive), grabs the other penis at the base and begins to stroke the full shaft from that base to his own base in complete
long strokes. Much like the LED eyes along the front of the kit
car from the vehicle on Knight Rider.
Ideally, both parties will want to ejaculate at the same time. Whomever the
semen enters first, becomes the submissive on the next go-around.