When two men get together, both put one hand on their respective erect genitalia, and one hand on the opposite persons arm. This way they will have their hand on their friends arm ( The one holding the penis). After this both men move their arms up and down. This makes it seem like there is no effort in self masturbation, so many men who do this can consider themselves "not gay", because they just moved their friend's arm while they were naked near each other.
" I didn't want to seem gay so me and bob duck ruttered together instead. "