Some girls might have done this because they mistakenly believed that male sexual desire is something important or hard to come by; but the girls I am referring to were mostly old enough or smart enough to know better. They wanted to experience my sexual desire because they needed the minimal affirmation it offered in order to feel good about themselves - or at least, in order to avoid feeling bad about themselves after realizing that the end was in sight.
I would call this situation pitiable, but ultimately pity is a wasted emotion, because it doesn't give enough credit to the agency of its object. So if you are still sleeping with a man who isn't as serious about you as you want him to be, I am not going to pity you, and I am not going to blame him. You and only you have the ability to change the situation.
You will only change the situation by demanding more in your relationships, and you will only demand more in your relationships if you believe that you deserve more in your relationships. And by a convenient loophole in human psychology, you will actually start believing that you deserve more in your relationships if you start acting like you deserve more in your relationships. So suck up the rejection and walk away.
1. Self-Improvement Takes Time
2. You Are Responsible for Your Own Romantic Happiness
3. Why Rejection Is a Good Thing