The frenulum is a fold of tissue that connects the foreskin to the glans. When this fold is too short, it can limit the movement of the foreskin at the base of the glans, causing discomfort during erections and sexual intercourse. The frenulum is a fold of tissue that connects the foreskin to the glans. When this fold is too short, it can limit the movement of the foreskin at the base of the glans, causing discomfort during erections and sexual intercourse.