If you have any concerns regarding your sexual health, or you want to learn more about your body and sexuality, start from this book:
Sex Matters for Women: A Complete Guide to Taking Care of Your Sexual Self by Sallie Foley and Sally Kope.
Another option is the old and reliable book written by a group of women:
Our Bodies, Ourselves.
This book grew larger and heavier with each new edition. Now it is a website:
Our Bodies ourselves today.