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The menstrual cycle is a recurring cycle of physiological changes in the females of some animal species that is associated with reproductive fertility.

This article concentrates on the menstrual cycle as it occurs in human beings.

Overview


Only human beings and the great apes experience a true menstrual cycle. Most placental mammals experience estrus instead. The menstrual cycle is under the control of the reproductive hormone system and is necessary for reproduction. In women, menstrual cycles occur typically on a monthly basis between puberty and menopause.

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@sweatfish26 You have a menstruation. I'm jealous.
croquis5 (小西一紘) Sat, 07 Nov 2009 12:53:06 -0000
@sweatfish26 You have a menstruation. I'm jealous.
MP Mensies Campbell was named after menstruation. #tipsforukvisit
fekauffman (Fletcher käuƒƒmàÑ) Sat, 07 Nov 2009 09:34:41 -0000
MP Mensies Campbell was named after menstruation. #tipsforukvisit
@Alacrion the actual "period" happens because during menstruation, the lining of the uterus must sh http://twitqa.com/?qid=846
shainee1 (shainee) Sat, 07 Nov 2009 08:23:35 -0000
@Alacrion the actual "period" happens because during menstruation, the lining of the uterus must sh http://twitqa.com/?qid=846
MP Mensies Campbell was named after menstruation. #tipsforukvisit
fekauffman (Fletcher käuƒƒmàÑ) Sat, 07 Nov 2009 07:00:22 -0000
MP Mensies Campbell was named after menstruation. #tipsforukvisit
Is beer a menstruation inducer???
iamsassyclaire (Melissa Bautista) Sat, 07 Nov 2009 05:33:21 -0000
Is beer a menstruation inducer???
Cabal ya tayangRT @gitafrylia: @deatiffany tummyache.menstruation :(
deatiffany (octiffany dea) Sat, 07 Nov 2009 05:26:53 -0000
Cabal ya tayangRT @gitafrylia: @deatiffany tummyache.menstruation :(

 
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His and Hers PMS Calendar - Featuring testimonials and ordering details.
Meta Description: [ The His and Hers pms premenstrual syndrome calendar helps couples in relationships improve their communication skills. Good communication is the cornerstone of every successful relationship. This easy to use tool will help you to communicate comfortably about PMS. Learn how to prevent next mont... ]

Kristin's Cloth Pads - Provides a pattern for cotton pads. Contains FAQ and information on sizing and care.
Meta Description: [ Cloth menstrual pads: the natural, organic, earth-friendly alternative for feminine hygiene from Kristin's Cloth Pads. Perfect for home birth kits and women of all ages. ]

Lunapads - Selling washable and cotton pads, paddded pants and an internal rubber cup. Includes testimonials and list of international retailers.
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Menses - Suppliers of a reusable internal rubber cup, with discussion board, testimonials and FAQ.
Meta Description: [ The Keeper menstrual cup, safe, economical and planet friendly menstruation from Menses in England UK. You do not need to spend a fortune, endanger your health and pollute the planet every month as The Keeper offers a viable alternative to pads and tampons for your periods ]

Mooncup - Featuring a silicone rubber cup, with FAQ, instructions and testimonials. [English, French, Spanish and Swedish]
Meta Description: [ The official Mooncup site. The Mooncup Menstrual cup is a healthy and environmentally friendly alternative to tampons. Discover why it is better than tampons ]

Moonwit - A women's collective provides education, a newsletter and absorbent products.

New Attitude - Offers a revolutionary, completely feminine undergarment invented and designed to relieve lower abdominal cramping.
Meta Description: [ A revolutionary, completely feminine undergarment invented and designed to relieve lower abdominal cramping is giving women a new attitude! ]

Olivia's Secret - Natural alternative to hormone replacement therapy provides safe, effective relief of common symptoms of menopause, PMS and associated nervous irritabilities.
Meta Description: [ This natural alternative to hormone replacement therapy (HRT) provides safe, effective relief of common symptoms of Menopause and PMS -- hot flashes, night sweats, bloating, mood swings, and more. ]

Terra Femme Tampons - A chlorine-free, cotton tampon developed by women for women.

The Diva Cup - A reusable silicone cup, worn internally to collect menstrual flow. Includes FAQ and testimonials.
Meta Description: [ The DivaCup Menstrual Solution is the latest innovation in feminine hygiene protection. Made from 100% medical grade silicone, it is the most convenient, comfortable and reliable alternative to tampons and pads. It is worn internally, and environmentally friendly because it's reusable. Ideal ... ]

The Keeper - A reusable rubber cup, worn internally to collect menstrual flow. Includes photographs, FAQ and testimonials.
Meta Description: [ The KEEPER and THE MOON CUP are small internally worn, reusable menstrual cup, made from natural gum rubber or silicone. An menstruation period alternative to tampons or pads, The KEEPER and THE MOONCUP can hold up to one ounce of your menstrual cycle flow and can be worn up to 12 hours ]

The Keeper Store - Selling a gum rubber cup for internal use, with detailed instructions and illustrations.
Meta Description: [ The Keeper is a revolutionary product for womens gynecological health. It is an internally worn, soft rubber, reusable menstrual cup and is a great alternative to tampons. ]

Vinnie's Tampon Cases - Offers period charts, Cramp Relieving bubble bath, and cotton cases in two sizes. Also contact information, fan club, store locator, and multimedia.

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