Yeah, that's kinda normal. :) You may be getting a little bit sexually aroused/excited - not enough to make you wet or get your clitoris stiff or anything, but enough to make it tingle down there. You feel that slight tingling feeling as the urge to pee.
Many girls (and boys) also feel the need to pee after masturbating or having sex, partly because of the leftover tingling feeling like the tingly urge to pee, and partly because pee (especially in boys, but somewhat in girls) helps wash away fluids and clean the reproductive tract.
Ummm, every day? Like a normal human....
not unless they are naked. not normal what so ever. if happens you need to seek medical attention.
Erections assist with sexual reproduction, to aid penetration.
Well, every girl is different. You need to get to know her better and find out yourself.
I'm sure there are surgical procedures. However, I don't see why you wouldn't want to have a erection. One way is not to have sex and/or sexual enjoyment! It is possible to use female hormones and/or androgen blockers to stop erections. For transsexual women, erections are annoying and remind them of the unwanted parts, so usually the loss of erections from the hormones is welcomed. Then after surgery, the only erections they could have would be from the clitoris. There are transgendered persons who are not transsexuals, and they may take hormones for recreational reasons and hate losing their male sexual abilities. In that case, adding certain progestins or getting plastic surgery instead of taking hormones might be alternatives for them.
No, it is not normal - you need to visit your doctor.
If you need too!
Yes, boys can get erections at any age and have been known to get them while still in the womb. It is completely normal and natural. As far as telling when or if it has happened, you really cant. And, honestly, I can't think of any reason you would need to. But, it is safe to assume an 8 year old has had a few. He probably wouldn't even notice it, and if he does notice he would not understand it. It is not until puberty that erections start to mean something to them when masturbation begins.
Yes every girl has 2. If there over 17 and still don't have it then they need to see a doctor. It's part of life, sweetie .
No, you need to gain some weight.
I don't see why you have an answer.
Not in standard urination. However, after erections, men often need to urinate, this is a biological function designed to "keep the pipes clean" and free of organic materials.