Home > Sex > Safe Sex > Glossary 09 February 2004 Frenulum The triangular area of skin on the underside of the penis, which attaches to the glans. Often considered the most sensitive area of the penis. 0 Check Are you a sex addict? » Ask Sexologist » Join Health24 on Facebook » Quiz Are you ready for sex? » The triangular area of skin on the underside of the penis, which attaches to the glans. Often considered the most sensitive area of the penis. NEXT ON HEALTH24X Help, my STI is incurable! 2016-09-30 14:41 More: Safe SexGlossary advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... From our sponsors Sun protection for all children Understanding your sunscreen The science behind cosmeceuticals Do you know these 5 facts about skincare? Live healthier The debate continues » Working out in the concrete jungle 7 top butt exercises for guys 10 things pole dancing can do for you The running vs. walking debate There are many different theories when it comes to the running vs. walking for health and weight loss. Veganism a crime? » Running the Comrades Marathon on a vegan diet Are vegans unnatural beasts? Can a vegan be really healthy? Should it be a crime to raise a baby on vegan food? After a number of cases of malnourishment in Italy, it may become a crime to feed children under 16 a vegan diet.