Sorry i know this is long but i would really apreciate any advice given. This weekend i went back to a girls house(id never met her before) after a night out. I have not had much sex before so i am very inexperienced. Anyway we were in bed and she told me she had her period which i didnt mind so i let her know and we went ahead anyway. Just before though she said a few things. two of which were "oh i want to feel your balls slap my ass" and "i could fuck you all night" this threw me off as i kinda figured she was up for a pretty hard fucking(i was more into a bit more of a softer experience). Now i have small balls and so there is no way they were going to be slapping ass so i turned her over and went in from behind. (as if things werent going badly enough all the booze i had drunk had afected the hardness of my penis) so thinking i wasnt going to satisfy her i started thrusting very hard and fast(there had been planty foreplay and she was slippery) but after like a minute she said it was hurting her cos being on her period was making her more sensitive. I feel terrible about the way i acted as i feel like i just treated her like an object. Really all i wanted to do was make her feel good but i just have no idea what i am doing (i think watching porn doesnt help either as its not reality) Anyway in the morning i just absolutely loved her she had the most beautiful way about her and was so nice to be around. I know i am going to see her again at some point and ive texted her a few times. My question is about her period, i have no idea about the female anatomy so is that common about being extra sensitive when on your period or was she just not wanting what i was giving.