Just plainly think about what she might feel afterwards... will she regret it.. how will that effect you? I am all for young people exploring their bodies, but you really really need to think of EVERYTHING that involves sex at the age of 15.. you can barely get a job yet, if she was to get pregnant you WOULD NOT BE ABLE TO SUPPORT HER, PERIOD, not to mention that your life would come to a stand still and everything you have planned for your future would come to an end.. school, post secondary. Everyone will look at her a different way, can you imagine the stares, comments? You can do what you feel you are ready to do, but I would suggest thinking more deeply about it as you have no clue as to the consequences.
the fact of the matter is this, is that clearly there are responsibilities but there are positive things that come from this experience as well. so don't do swaet it, just simply be responsibile. as for the original Q.... no matter what you do, you can't think of female pleasure the way a guy experiences it. Guys are like dogs, dogs you can run up to, rough house, throw around on the groud, slap in the face and wrestle with and they love it, thats their thing.. Women are like dumb cats in the sense that you can't run up to a cat and throw it around, your gonna get clawed real quick. With cats, it wants to think that IT chose to come over to you. First its gonna walk by, possibly brush the shin of the new person in the room, and maybe if your not giving off some crazy vibe, it will LET you pet it. No rubbin it the wrong way like a dogs fur. Ya dig? Too many guys think that theres an orgasm in that vagina to be had, and I am gonna rub it out of her come hell or highwater, just the way that guys work, no no. You gotta be gentle, Tease her, pay attention to all of her body like Rg said. Feel out the situation, sense what she likes by how she responds, let her guide you, just like that cat! lol. you'll be fine and good luck mayn
guess i have to wait a little longer till i fully complete pubery dam you cruel world!! 
i dunno, she might just be saying that but ive heard it from a few ppl. i know its not going to last long, but im going to try to make it last as long as possible. as long as i get her to cum first then its mission accomplished. 
