There is no definitive answer to which side of the ear straight guys pierce. However, there are cultural and historical associations with certain sides. In Western culture, there is a prevailing consensus that a guy with a pierced left ear is conveying his straightness, while piercing the right ear suggests homosexuality. This association originated from the rap world, as well as the biker and pirate communities, who adopted the left ear piercing to indicate their straightness. However, this is not a universal rule, and some people may choose to pierce both ears or pierce the right ear to express their sexuality. Ultimately, the choice of which ear to pierce is a matter of personal preference and does not define a persons sexual orientation.