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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)

Female Menstrual Cycle
Evolution & Menstruation, Anatomy, Ovulation, Hormones, Pictures

'I have the feeling that in spite of all the pain, unpleasantness and nastiness I have a sweet secret.' (Anne Frank, writing about menstruation in her diary)

Hi there. Menstruation is very interesting from an evolutionary perspective. I will be collecting latest research and reports, for now here are some ideas to explore:

Age of first period in tribal society compared to present day.

How many periods women had in tribal society compared to present day (i.e. in our evolutionary past women would menstruate, get pregnant, breastfeed. Therefore have many less periods.)

Studies show a relationship between high number of periods and breast cancer.

Studies show that girls begin to menstruate earlier if their father is not around.

The visibility of menstruation as opposed to hidden ovulation (sign of fertility).

Why do women menstruate if it is such an unnecessary waste of nutrients?

Menstruation ceases if environment is harsh.

Synchronicity of female cycle with other females.

Menstrual cycles of lesbians compared with heterosexual women.

Role of orgasm and seminal fluid.


Breast Cancer Risk and Number of Menstrual Cycles

This study observed an increased breast cancer risk in women with a higher number of cumulative menstrual cycles in their lifetime.

Read More: Breast Cancer Risk and Number of Menstrual Cycles

Hormones in Menstrual Cycles may affect Cancer Risk

Several reproductive factors have been linked to increased risk of breast cancer - from early menses and late menopause to childlessness and late age at first pregnancy. A new study would add yet another: menstrual cycles that are typically either shorter or longer than average.
The researchers suspect that hormones in general, and their peaks during an ovulatory cycle, collectively affect cancer risk.

Read More: Menstrual Cycles may affect Cancer Risk

Breast Cancer, Menstruation, Diet & Exercise

The purpose of this study is to examine the relationship between diet, physical activity and when a woman has her first menstrual period (menarche). The exact cause (or causes) of breast cancer remains unknown; however, certain aspects of a woman's life appear to increase her chances that she will develop breast cancer during her lifetime. A woman who has her first menstrual period at an early age is more likely to be diagnosed with breast cancer than a woman who has her first menstrual period at a later age.

Read More: Breast Cancer, Menstruation, Diet & Exercise

The Society for Menstrual Cycle Research

From the website: 'The Society for Menstrual Cycle Research is a nonprofit, interdisciplinary research organization. Our membership includes researchers in the social and health sciences, humanities scholars, health care providers, policy makers, and students with interests in the role of the menstrual cycle in women's health and well-being.'

The Red Web Foundation: Positive Menstrual Health

'When women and girls view their bodies as powerful sources of wisdom, profound healing occurs at the individual’s physical, emotional and spiritual level.' (Kelly Rose Mason)

From the website: 'The Red Web Foundation is a non-profit organization dedicated to supporting a positive societal view of girls' and women's bodies and menstrual cycles from first menstruation (called menarche) through menopause.

Read More: The Red Web Foundation: Positive Menstrual Health



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.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)

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Create some good Sexual Karma - Share this Knowledge - Thanks!

Support an open honest discussion of human sexuality by sharing this knowledge.
Female menstrual Cycle: Evolution & Menstruation. Anatomy, Ovulation, Vagina, Emotions, Hormones, Pictures, Sex Fetish

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