virgin pussy
The answer could be yes and no. Matters how fast a girl matures but most girls are mature by 15. Then another factor is how much a girl plays with her self. My girl, i'm her first and i think she is kinda loose, of course i would never tell her that. but she played with herself alot to make it that far as a virgin. when i first figered her and did 3 fingers i was like, I was thinking to myself, this is what i thought about a virgin. And i know some people might say, well maybe she wasn't, but she is. Other than those type of factors, most likely 15 to 18 should be same.
hey johnny, been reading your posts and i cant help thinking you worry too much. trust me when i say there is a 99.9 % probability that your relationship will not last whether you have a 10 inch penis or 4 inch. if i was in your shoes i would have sex with your gf as soon as shes consenting age :s. you obviously like this girl very much, but just accept what i said above and take the relationship slowly, in my experience - the less you worry the better it gets! good luck man 
I'm a romantic idealistrofl well the main difference between 15 yr old pussy and 18 yr old pussy is that one will get you thrown into jail 
Vaginas come in a wide variety of shapes & sizes. They can be tighter, deeper etc. genetically regardless of any sexual experience. I believe from my experience and from talking with many women, most can handle a good bit of girth but few can handle a lot of length. And both factors contribute, the thicker the penis the less length they can take. Yes, there are some "cow pussies" and "size queens" but not many women can take all of a real NBP 8 x 6. And fewer still can handle 9 x 7 or larger. I think that a lot of erotic stories are pure bullshit, like the tight young chick who's never had a big dick taking a 10 incher all the way to the balls. Even most adult entertainment actresses can't take a huge dick, I've read that some refuse to work with anyone over 8". I've seen several clips of Mandingo, and only in one did I see a chick who could take him all the way. Yes, there are exceptions, and some women who get into really stretching themselves with fisting or using extreme toys. But on average I think about 7" - 8" length and 6+" girth is the upper limit if you want to be able to "bury the bone."
Just make sure you use a condom.
tearrhapsody said:well the main difference between 15 yr old pussy and 18 yr old pussy is that one will get you thrown into jail
In a few states and a number of countries it won't. Then again in those states and countries her father will probably kill you with his shot gun, unless you are going to marry her.