It’s an odd term, 'girlfriend,' particularly for grown persons. And in practice it provides an even odder concept. Generally speaking, in adults it described a woman, not a girl, who was willing to provide sex, not friendship. In fact, from what I had observed it was quite possible for one to actively dislike one’s girlfriend, although of course true hatred is reserved for marriage.
I had the honor of meeting a young Pakistani woman named Malala Yousafzai, who was shot and nearly killed just for trying to go to school. I also heard about how nearly 300 girls in Nigeria were kidnapped from their school dorms in the middle of the night. There are girls like this in every corner of the globe. In fact, there are more than 62 million girls worldwide not attending school, and that's an outrage.