Why would she do this?

I'm a 23 year old guy and my girlfriend is 21. She is the sweetest girl I have ever met. The thing is, is a really religious and is pretty innocent. One day we were talking and she asked me if I looked at porn and I said "no, but I do masturbate." She didn't have a problem with me masturbating, but she felt like porn was cheating. The next day she was over, we were making out and she unzipped & pulled down my pants. She proceeded to give me a ********. I asked her why she was doing it. She said that she knows that sex is an important part of a relationship, and she wants to be the one to give me my pleasure. Almost every time she comes over now, she tries to give me a BJ, hand job, hump me, or give me some kind of sexual pleasure of some type before she leaves. She is waiting on marriage for sex, but thinks I deserve to get my pleasure from a woman. What do you think about this? Why would she do this?