Do whatever gets you off.
These fears are more common than you might think. Many women believe they won't be able to enjoy sex without their favorite toys, and that if that's true, it means they have an addiction that their partners will find disgusting. Many men fear being replaced by a toy; they feel sexually inadequate when they discover their female partners use toys to masturbate.
Unfortunately, there isn't a whole lot of good research on female sexual health out there. But as far as I can tell, there has never been any research that indicates vibrators can cause sexual dysfunction. In fact, a few studies suggest that women who masturbate are more satisfied with their sex lives, enjoy sex more, and have more orgasms.
So, if a woman often uses a sex toy, it means she has an active libido. She likes sex and that's a great thing, both for her and for her partner. But many women also believe that regularly masturbating with a toy will somehow take the place of a partner.
First off, sex toys aren't replacements for people. A sex toy won't take you to dinner, cuddle or whisper sweet (or naughty) nothings in your ear. However, if a woman is masturbating with a vibrator regularly, she's turning to herself (and her toy) rather than finding a different partner.
Even though this may sound like an addiction to vibrators, it's not. Using a vibrator actually makes it easier to have an orgasm. In essence, your body has discovered a way to reach climax consistently. Therefore, it becomes tempting to reach for your favorite toy during a sexual encounter because your brain and body know that's what gets you off.
But sex toys aren't addictive. It's simply the pleasure that people get addicted to, whether it comes from another person or a sex toy. Once someone has found a special technique or toy that hits the spot every time, they don't want it to stop.
Remember, vibrators and other sex toys are made to stimulate particular parts of the body. They're specifically designed to reach places most tongues, fingers and other bodily parts can't. They also give you power over your own orgasm. With a toy, you control every movement, the depth and the speed. You can hit the same spot whenever you want with no fumbling and no guess work. Who doesn't want a guaranteed orgasm?
Addiction suggests something harmful or wrong, and frankly, there's nothing harmful about using toys as a means to improve your sex life. People can definitely become accustomed to using sex toys, but there isn't a withdrawal period if you stop, and you can easily switch back to masturbating or having more traditional sex and still reach climax without sex toys.
My opinion? If using a vibrator every time you have sex means you have an orgasm every time you have sex, then everyone wins. He gets off, she gets off. Where's the harm in that?