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In heterogamous species, male is the sex of an organism, or of a part of an organism, which typically produces smaller, mobile gametes (spermatozoa) that are able to fertilise female gametes (ova). A male individual cannot reproduce sexually without access to the gametes of a female.

There is no single genetic sex-determination system which controls sex differences in different species. The existence of two sexes seems to have evolved multiple times independently in different evolutionary lineages. Other than the defining difference in the type of gamete produced, differences between males and females in one lineage cannot always be predicted by differences in another.

The concept of male/female dimorphism between individuals or reproductive organs is not limited to animals; male gametes are produced by chytrids, diatoms, and land plants, among others. In land plants, female and male designate not only the female and male gamete-producing organisms and structures, but also the structures of the sporophytes that give rise to male and female plants.

Secondary sex characteristics


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OK, need help for secret Santa gift: $10, suitable for male/female, no booze or gift cards. Ideas?
waqueau1 (waqueau1) Sat, 19 Dec 2009 00:33:32 -0000
OK, need help for secret Santa gift: $10, suitable for male/female, no booze or gift cards. Ideas?
RT @PrinceSammie: if @kanebeatz don't send me some heat asap im gonna expose his government & tell errybody he was in male chorus
KGOchoCinco (Kennedy Grant Jr) Sat, 19 Dec 2009 00:33:30 -0000
RT @PrinceSammie: if @kanebeatz don't send me some heat asap im gonna expose his government & tell errybody he was in male chorus
How is Colonel Sanders like the typical male? All he's concerned with is legs, breasts and thighs.
Maracev (Mari) Sat, 19 Dec 2009 00:33:16 -0000
How is Colonel Sanders like the typical male? All he's concerned with is legs, breasts and thighs.
Finished almost all our Christmas shopping in three hours. Skewing male? Or more efficient from practice?
kimajj (Kima Jude) Sat, 19 Dec 2009 00:32:58 -0000
Finished almost all our Christmas shopping in three hours. Skewing male? Or more efficient from practice?
@Cinefilly I wish the female characters were as well drawn as the male ones... or, at least, a little less incompetent at the end.
crossoverman (Keith) Sat, 19 Dec 2009 00:32:52 -0000
@Cinefilly I wish the female characters were as well drawn as the male ones... or, at least, a little less incompetent at the end.
RT @trystan86: @GMThree u look like a male lady gaga in that pic dude<---lmao but worry more about not gettn fucked in the army! Bye hater!
GMThree (GMThree.) Sat, 19 Dec 2009 00:32:28 -0000
RT @trystan86: @GMThree u look like a male lady gaga in that pic dude<---lmao but worry more about not gettn fucked in the army! Bye hater!

 
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A Patient's Guide to Male Infertility - Thorough overview of the causes and treatments of male infertility.

404 American Urological Association - Male reproductive health - Articles on male infertility including varicoceles, sperm disorders and ejaculation problems.

Center for Male Reproductive Medicine and Microsurgery - At Cornell University Weill Medical College. Provides the most updated information and success rates for vasectomy reversal, no-scalpel vasectomy, varicocelectomy, testicular and epididymal sperm retrieval; treatment of obstructive and non-obstructive azoospermia for male infertility.
Meta Description: [ vasectomy reversal, vasectomy reversals, male infertility, vasectomy, vasovasostomy, no-scalpel vasectomy, NSV, varicocele, varicocele repair, varicoceletomy,microsurgery, sterility, sperm, semen, testis, testicle, erectile dysfunction, ED, Impotence , New York, Cornell Reproductive Medicine, Dr.... ]

Chinese Traditional Medicine And Infertility - Describes in detail how practitioners in China solve infertility with TCM strategies and herbs.

Free Fertility Foundation - Provider of frozen donor sperm at nominal costs; includes goals, fees, and donor catalog.
Meta Description: [ we offer various fertility services at no charge to you. ]

How Often is Infertility Attributable to the Male Partner? - Information from Abington Urological Specialists.
Meta Description: [ Urological Practice with varying interests including voiding dysfunction, incontinence, urologic oncology and male infertility ]

Infertility-Male - Information men's health issues by Dr. Larry Lipshultz in Houston, Texas.
Meta Description: [ Information on male infertility, men's health issues, vasectomy reversals, and more by Dr. Larry Lipshultz in Houston, Texas ]

Information on Infertility - Information on causes, diagnosis, testing and treatment of male infertility.

Male Infertility Information - Discusses factors in infertility, diagnosis, treatment, artificial and donor insemination and nutritional issues.
Meta Description: [ Overview of male factor infertility issues including diagnosis, testing and treatment. Georgia Reproductive Specialists 404-843-229 info@ivf.com ]

malefertility.md - Information about male reproductive health, infertility diagnosis and treatment options. Edited by a specialist located in San Diego.
Meta Description: [ Male infertility clinic in San Diego, California. We offer the latest male fertility treatments and solutions for impotence problems. ]

500 Semen Analysis - A Patient's Guide - What is looked for, what do the tests mean, what can affect the test (causes of errors), what is normal and what happens next.

Semen Analysis Home Test Kit - At home, confidential semen analysis test kit available through Evolution Diagnostic Laboratory, Inc.
Meta Description: [ Reproductive health potential! Realize reproductive health potential with fertility testing sent via mail to find your sperm count. Confidential fertility testing and sperm analysis for low sperm count is a breakthrough for sexual health! ]

Shared Journey: Male Factors - Overview with links to many articles on diagnosis, testing, treatment, and coping with male infertility.
Meta Description: [ Here you can find full and current information on infertility due to male factors, as well as diagnosing tests and treatment. ]

Sperm Center - Listing of US based Sperm Banks and Sperm donors.
Meta Description: [ Listing of sperm donors from all US sperm banks. ]

SpermBanker.com - Listings of sperm donation centers in the USA. Visitors can comment on experiences with various programs.

Toxic Exposures and Male Infertility - Article by Steven M. Schrader, Ph.D. of the National Institute for Occupational Safety Health.

Varicocele Specialists - A national directory of physicians expert in varicocele repair and many FAQs about varicocele.

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Mi fa male il mondo - Giorgio Gaber (2a parte)
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