Yes, they certainly can. It is best to wait to have sex until you are much older and able to handle the responsibility that comes with it, but if you insist on having sex, you should be using protection each and every time you have sex.
Teen sperm is very fertile. Age only has any significance on fertility of sperm with regard to some much older men, like your grandad for instance!
yes because when you are 15 you are already going thru puberty and your sperm is fertile
Fertile men should have sperm that is between light gray to off-white. There is not a perfect color that will indicate fertility.
Yes, a teen girl can get pregnant by one drop of sperm. That is if she has already had her period before.
NO
Sperm of a fertile male.
You can't.
How long sperm can survive in the female body depends on how healthy the sperm are and whether the female is fertile at the time. If there is fertile quality cervical mucus present then sperm can potential survive for up to a week within her body.
It doesn't depend on how much of sperm is produced for a man to be fertile but it depends on the quality of the sperm. Many lifestyle factors affect the quality of sperm, eg. Smoking, excessive alcohol intake , temperature at which the testicles are kept at, etc.
they gave females fertile sperm.
the sperm finds a fertile egg and makes a baby
It's not harmful at all.
Yes, however sperm count decreases with age.