For a considerable period, the consensus held that the glans of the male organ was the primary site of sensitivity. However, recent investigations suggest the existence of an even more responsive region within the male body.
Andrology specialists from Spain executed a detailed neuroanatomical examination of the tissues comprising the male sexual organ. Their findings indicated that the highest concentration of nerve endings resides in the inferior segment of the organ, specifically around the frenulum—an area now termed the frenular delta. For quite some time, anatomists and sexologists largely overlooked this particular zone.
Presently, researchers posit that the male frenular delta might fulfill a role comparable to the female “G-spot” (Gräfenberg spot). This erogenous region, situated on the anterior vaginal wall, is widely recognized as exceptionally reactive to stimulation, potentially leading to a vaginal orgasm considered deeper than one achieved through clitoral stimulation.
Until recently, the penile glans was overwhelmingly regarded as the nucleus of male erotic sensitivity. An alternative perspective was initially introduced in 2001 by New Zealand pathologist Ken McGrath, who identified a triangular area on the underside of the penis, adjacent to the frenulum, which he christened the “frenular delta.” McGrath theorized that this area could be pivotal for sexual responsiveness, paralleling the function hypothesized for the female “G-spot.” Despite this, the frenular delta has not been independently recognized as a distinct anatomical structure within standard anatomical texts.
A recent study conducted by Spanish andrologists from the University of Santiago de Compostela validated the importance of this area. The scientists analyzed tissue samples procured from 30 human embryos (aged between 8 and 24 weeks gestation) and 14 adult males (ranging from 45 to 96 years old). Microscopic sections were processed and treated with specific stains designed to illuminate nerve fibers and sensory structures.
The analysis revealed a biphasic development of the neural network during the embryonic phase: from the 8th to the 16th week, there occurred a period of vigorous neural fiber outgrowth into the skin (hyperinnervation); subsequently, from the 17th to the 24th week, specialized sensory endings responsible for detecting touch and vibration took shape. In the region of the frenular delta, branches from both the dorsal and perineal nerves converge, resulting in the maximal density of nerve bundles and receptors being established there.
The examination of adult male tissues substantiated that the frenular delta harbors the greatest number of sensory corpuscles, including mechanoreceptors such as Krause end bulbs, known for their acute sensitivity to tactile input and vibrations. Although the penile glans also contains a significant quantity of nerve endings, these are distributed more sparsely. In contrast, within the frenular delta, the nerve endings are organized into dense clusters, achieving concentrations of up to 17 corpuscles per defined area.
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