Ok, this is for all the guys out there, the ones born with XY Chromosomes.?
93769
I use a counter clock wise swirl then a ball sqeeze(upward)  But I still dribble in my shorts 8'-(
617160
Chromosomal abnormalities, and missing or extra chromosomes.\n\nAlso sex: there are some XY people who appear to be female.
713037
to the best of my knowledge, a man must have a Y chromosome.  the XXY man is Kleinfelter's and usually sterile.\n\ni'm going with DNA and RNA being acidic, since they are deoxyribonucleic acid and ribonucleic acid.
1168713
Mate, your a guy right??? Well it will just come naturally too you.... ha ha ha
1105660
People are born with both genitals.  They're called hermaphrodites.
128418
Every animal comes from a "generic" base model.. the "Y" chromosome chooses to make that base model male.  All body parts translate into some part or another between the two sexes.  So, men AND women therefore have nipples.
544510
i think i have always known. i had never had any interest in girls. Even as a young young child i was fascinated by the male body. Not sexually but how it was built. i had a doll (lil ashamed to admit) and my brothers were all into the G.I. Joes. I just thought they were awesome cause they were built. anyway off the subject. Just because I knew i was at such an early age, some people just can't figure it out so fast. You want to be normal, but what is normal really? Following a lot of people around, trying to fit in, pretending to be something your not? To me i am normal. I do what i do and thats all there is to it. I am not your stereotypical gay male. I hate shopping, i have no fashion sense, and i am a slob.
920293
gonosomes.    which are the sex chromosomes ! Hope this is it !! :o)
1068253
Male. My ring finger, of course. Hint; developmental testosterone.
651579
As many as a young really nice looking guy can get.  I heard it was the same for the boys.  Change guy to girl.
460679
XXY is called Klinefelter's Syndrome. Individuals with Klinefelter's are male instead of female, and they are almost always sterile.
318607
You've got male genitalia.
780535
There are 23 pairs of chromosomes found in each cell of the body, and each contain genes that determine our coloring, our features, and our sex. Women inherit two X chromosomes -- one from each parent, written 46,XX.  Men inherit an X chromosome from their mothers and a Y chromosome from their fathers, written 46,XY.  Some individuals, however, have an additional X chromosome in their chromosomal arrangement, referred to as 47,XXY, or more commonly, just XXY.  The cause is unknown, yet XXY occurs in approximately 1 in every 500 to 1000 live male births, making it one of the most common chromosome variations.   The XXY variation is identified in an individual through a karyotype, a buccal smear, or FISH.
1008817
The mechanism for an abnormal amount of X or Y is called nondisjunction in meiosis of cellular division. However there is no possible way for a man to father only one gender.\n\nHaving only a Y is not enough DNA for viable offspring, so the gamete automatically aborts.\n\nHaving only an X results in a female with a condition called Turner's Syndrome. This will not cause a phenomenon of having only boys or only girls because the female does not choose the gender anyway.\n\nThe only possible way for a man to have a higher possibility of having boys is if he has an extra Y chromosome (XYY) caused by nondisjunction. Then the chances that the offspring is a girl is 33% and the chances of having a boy is 67%.\n\nAnd in case you were wondering, a male with XYY has Kleinfelter's syndrome and is infertile.\n\nAlso, you're saying that you have examples from literature, which may not be reality. It's highly unlikely that a father has 15 children of the same gender. I'd say literature tends to exagerate :)
190354
every guy or boy or man
219225
It's part of our genetic make-up.  Comes from having the X chromosome.
496136
Not that I'm aware of. This genetic condition involves the X and Y chromosomes, and not anything else.