That would be a piece of threaded pipe whose length is 2 to 3 times the diameter of the pipe.
Yes, each normal nipple has multiple openings.
this can be very normal and there is nothing to worry about, it is called an inverted nipple.
Normal nipple sensation is when it is stimulated then it will erect and constant stimulation makes the uterus contract.
yes it is normal
Yes, this is normal. The nipple stretches as the baby sucks it towards the back of his/her mouth to draw the milk from the breast. The nipple will soon return to its normal shape.
That means you're gay.
Holes in the nipple are normal There are holes through which milk can flow, and holes for the oils that lubricate the nipple. If this is a new hole in your nipple, see your health care provider for accurate diagnosis.
Yes, after extended use, nipple suction does make the enlargement and elongation permanent: the nipple will not stay erect, but will stay out and function like a normal nipple--enlarging when stimulated.
It is normal for the nipple shape to change during puberty (in both boys and girls) and during pregnancy. If your nipple is changing at other times, see your health care provider.
it's normal
No, it is not normal - you need to visit your doctor.
A retracted or inverted nipple is one that doesn't stick out or protrude past the level of the surrounding skin. If the nipple has always been this way, there is no cause for concern -- it's normal. If a nipple that used to protrude now is retracted, the finding could be a sign of a mass or tumor in the breast.