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A description of all aspects of male sexuality, including penis size and health, penile anatomy, masculinity and sex.
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Penis: Penis,, the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. The corresponding structure in lower invertebrates is often called the cirrus.
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physiology, innervation, molecular signal transduction of the Erection, Physiology of the Penis, from the online textbook of urology by D. Manski
Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth muscle.It is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system.
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firmer, engorged and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular and endocrine factors, and is often associated with sexual arousal or sexual attraction, although
