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.
I have been with guys who thought because I used vibrators and dildos meant they weren't enough. They did however like me using my clit vibes during sex, I can orgasm without vibrations but its easier then me trying to rub my clit while they are pounding away or for them to rub it while they are pounding away. My current partner LOVES that I have tons of toys an he requests I have a few laid out when he comes over or that I bring a few when I go to see him