Hello, 19 M and recently got together with my partner. As we got more and more intimate, she's shown me a side of her that likes to be hurt during sex, particularly by my penis, causing her vagina pain. She likes it rough, and whilst I am down for it, I have never been with a partner who likes it this way, and am looking for some guidance on how to fuck her so hard "she can't walk". Do I just go at it very hard? Are the particular positions I could try or resources I could look into? My penis measurements themselves are slap bang average so I sometimes wonder if I just don't have the physical attributes to be able to do that to begin with. Any suggestions would be greatly appreciated, many thanks.