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muscle boner Contraction of the ischiocavernosus muscles produces the rigiderection phase. Rhythmic contraction of the bulbocavernosus muscle is necessary for ejaculation.. Get ready to dive into the best 18+ content—subscribe to our Telegram channel today!Discover the full library of 18+ content by subscribing to our Telegram channel. Your penis is not a muscle, though it does rely on muscles internally and externally to function. The ischiocavernosus muscles, bulbospongiosus. muscle boner Unlock an exclusive collection of adult content on our Telegram channel—join now and never miss a thing! Tap "open" to join our community and subscribe to our channel for the latest updates. Contrary to popular belief, the penis isn't a muscle. But that's not to say it doesn't contain a unique muscular structure. The most intense adult content is waiting just for you. The ischiocavernosus muscles assist in producing and maintaining erection by impeding venous return from the CCP.