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Introduction / Summary (2018): Hello and welcome to our Sexuality pages. While this is not a pornographic site, it is provocative - founded upon what people search on the Internet (which is very interesting!). We then relate this to our biological and cultural evolution.
Sex is obviously important to people - and if you want to improve your sexual relationships then knowing the truth about our human evolution is the best foundation. By opening our minds to a greater diversity of behaviors, this knowledge will help you creatively cultivate healthy pleasurable moral attitudes and sexy smutty relationships (free from religious guilt & cultural myths).
Support an open honest discussion on the truth of our sexual evolution and behaviour. If you support sex positive, moral, informed sexual behaviour please share this knowledge. (These pages have a diverse collection of fascinating information relating to our human sexual evolution so people will appreciate it - see our 'nice letters' page!).
Sincerely, Karene.
"It is not enough to conquer; one must learn to seduce." (Voltaire) - "Desire is the essence of a man." (Spinoza)
The Penis
Evolution, Pictures of the Male Reproductive System, Anatomy
& Size of Human Penis, Sexual Health, Erection, Orgasm, Sperm, Testicles
Male Physiology - Anatomy of the Penis & Erections
From the website: 'The penis is composed of two functional compartments: the paired corpora cavernosa and the corpus spongiosum. Under the microscope, the tissue of the corpora cavernosa consists of bundles of smooth muscle fibers intertwined in a collagenous extracellular matrix. Interspersed within this tissue is a complex network of endothelial cell-lined sinuses, arteries and nerve terminals.
Figure 1. Anatomy and mechanism of penile erection. The cavernous nerves (autonomic), which travel postarterolaterally to the prostate, enter the corpora cavernosa and corpus spongiosum to regulate penile blood flow during erection and detumescence. The dorsal nerves (somatic), which are branches of the pudendal nerves, are primarily responsible for penile sensation. The mechanisms of erection and flaccidity are shown in the upper and lower insets, respectively. During erection, relaxation of the trabecular smooth muscle and vasodilatation of the arterioles results in a severalfold increase in blood flow, which expands the sinusoidal spaces to lengthen and enlarge the penis. The expansion of the sinusoids compresses the subtunical venular plexus against the tunica albuginea. In addition, stretching of the tunica compresses the emissary veins, thus reducing the outflow of blood to a minimum. In the flaccid state, inflow through the constricted and tortuous helicine arteries is minimal, and there is free outflow via the subtunical venular plexus. [Reproduced from T. F. Lue: N Engl J Med 342:1802–1813, 2000 (2 ). © Massachusetts Medical Society. All rights reserved.]
https://edrv.endojournals.org/cgi/content/full/22/3/342#SEC2
Evolution, Human Reproduction & Fertilization: Sperm Competition & the Penis
A very interesting essay from the journal of Evolutionary Psychology on sperm competition and its role in shaping the human penis, (size, length, width, forceful ejaculation), evolutionary strategies for successful fertilization i.e. semen displacement and coagulation. On sexual intercourse and evolutionary benefits of deep penis thrusting, function of the foreskin and effects of circumcision, premature ejaculation, female reproductive strategies i.e. copulation with multiple partners, human sexual behaviour and wife rape (males having sex with their partner if suspecting them of infidelity).
Read More: Evolution, Human Reproduction & Fertilization: Sperm Competition, Semen Displacement & Penis
Analyse
any human emotion, no matter how far it may be removed from the sphere of
sex, and you are sure to discover somewhere the primal impulse, to which
life owes its perpetuation. ... The primitive stages can always be re-established;
the primitive mind is, in the fullest meaning of the word, imperishable.
... Mans most disagreeable habits and idiosyncrasies, his deceit, his cowardice,
his lack of reverence, are engendered by his incomplete adjustment to a
complicated civilisation. It is the result of the conflict between our instincts
and our culture. (Sigmund Freud)
Create some good Sexual Karma - Share this Knowledge - Thanks!
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Support an open honest discussion of human sexuality by sharing this knowledge.
https://www.sexualevolution.org/penis.htm
Male Reproductive System: Anatomy of Human Penis.
Sexual Health, Pictures, Erection, Orgasm, Sperm, Testicles
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