Scientists from the University of Santiago de Compostela in Spain have identified the male "G-spot," a region that is known as the "on-switch" and can induce intense orgasms upon stimulation. The researchers found the elusive area, the frenatic delta, a triangular zone on the underside of the penis where the head meets the shaft. This discovery was published in the journal Andology. The study found that the area is innervated by perineal (pective) nerve branches and dorsal (aft-facing) nerve. It also revealed that the frenational delta contains more nerve bundles and sensitive receptor clusters than any other region. The discovery validates the existence of the region as a centre of sexual sensation.