Could this be an STD without sex?

My friend and her boyfriend have made out on several occasions. Basically, she has been itching on her clitoris and around it, it's even red and sometimes it burns when she urinates but not on the inside...just when the urine hits the outside of her genital. But they have NEVER had sex, she said the only thing they do is hump each other....she put her private on his while naked...could this possibly be an STD?..She said he doesn't have anything and neither does she (virgin). So what STD could this be? She is only 17 and afraid to ask her parents to take her to the gynecologist because they are very strict. She is waiting until marriage, but they are in love so that's the way the show it...anyway let me know. Also this started about over a year ago, but it only happens every few months that's why she thought maybe it could be just a vaginal itch.