sex - sexHow many groins do you have? Groins are the oldest and most common shore-connected, beach stabilization structure. They are structures that extend, fingerlike, perpendicularly or nearly right angles from the shore. In human anatomy, the groin areas are the two creases at the junction of the torso with the legs. Assuming that the have sex-education class where you went/go to school. Maybe you should not have skipped that class.