In fact, there's nothing in the Bible prohibiting masturbation. Look it up in Genesis 38. Americans are uncomfortable about masturbation because we're ambivalent about sexual pleasure that isn't redeemed by romantic love. And, of course, we're all taught that the point of sex is procreation, not recreation. But this flies in the face of our personal experience.
Masturbation feels good.
And women, in particular, can teach themselves to orgasm by practicing with a vibrator, pillow, running water or their own hand. As a sex therapist, I never ask couples if they masturbate. I've learned how horrified many people are to acknowledge their private habit. Instead, I ask people if they think their mate masturbates. It's often the beginning of an intimate conversation they didn't expect to have.