I'm not a girl, but you may want to check out this web site:
www.actionlove.com. Warning, it's very blunt and open about sexual problems. It's not an xxx site, but it could offend some due to nature of the discussions. Look up information on orgasms, and expecially the information on nutrition for the brain and reproductive organs. There is information and techniques there for the man to learn to help properly arouse a woman. Hope this helps.