I never worry about that with my guy. He loves to use toys on me and loves to watch me use them on myself. He knows that toys can't possibly be a substitute for the real thing, and conversely the real thing can't possibly be a substitute for toys! There's no comparison, my fiance's penis doesn't vibrate, and my vibrator isn't really a penis.
We both know that it's comparing apples to oranges. It's not that he's inadequate, it's that sometimes I want something no human being can give me.