Only if you want to stick it in her back door
15 year olds shouldn't be having sex.
First if it is that small you should get it looked at by a doctor and second you could satisfy a girl who had a small enough vagina. Always wear a condom and always make sure you are of age.
It is a little below average for an adult male on a worldwide ave but it is certainly enough to work with and satisfy a girl.
No - if a girl has a penis then she is physically male and thus doesn't have a uterus, as such she does not menstruate.
It depends on what term of satisfaction you are talking about...
You may be confused. Girls do not have a penis.
The size of the penis has nothing to do with your ability to get someone pregnant. Its your sperm. So yes you can get a girl pregnant with a 4.5 in penis.
Length is less important then breadth given that in most women the penis can only be inserted so far. Between 3 and 5.5 inches is normal. Although cliche it's not that size that matters. But how you use it. The larger it is the more chance of you causing immense pain.
I'll satisfy my best friend that girl is not for you and girl is interested in me.
a penis
size dont matter, its how you use it, sometimes that is, girls tend to look at it this way, The bigger it is, that harder it is to fit, so smaller then 5 is bad, but larger is good. :D
It is wrong to say "the penis grows when a girl is around". Actually, the vessels inside the penis relax to let more blood into the veins of the penis (we call it cavernous vessels). This engorgement of vessels makes the penis get larger in case the girl is available for a penetration. This is called erection, not growing.