Erection: Erection,, enlargement, hardening, and elevation of the male reproductive organ, the penis. Internally, the penis has three long masses of cylindrical tissue, known as erectile tissue, that are bound together by fibrous tissue.
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THE CLITORIS DURING INTERCOURSE AND ITS IMPORTANCE TO THE FEMALE ORGASM by catherine yronwode
Explore the function, internal structure and overall anatomy of the vagina, an important feature in the female reproductive system.
Copulation ranges from a purely reproductive activity to one of emotional bonding. For example, sexual intercourse and sexual activity in general often play a strong role in human …
Found only in men, the prostate is a walnut-sized gland that grows throughout a man’s life and may eventually interfere with or prevent urination by blocking the urethra.
Human aging: Human aging, physiological changes that take place in the human body leading to senescence, the decline of biological functions and of the ability to adapt to metabolic stress.
Urethral intercourse or coitus per urethram is sexual penetration of the female urethra by an object such as a penis or a finger. It is not the same thing as urethral sounding, the act of inserting a specialized medical tool into the urethra as …
The prepuce is a common anatomical structure of the male  and female  external genitalia of all human and non-human primates; it has been present in primates for at least 65 million years, and is likely to be over 100 million years old, based on its commonality as an anatomical feature in mammals  Certain cultures have excised the prepuce
Effective public health programs, research, and policy relating to human sexuality, pregnancy, contraception, and the transmission of sexually transmitted infections (including HIV) depends upon knowledge of the structure (anatomy) and function (physiology) of the male and female reproductive