This is complex topic… well, my ex had fleshlight hidden or im not sure how it went, maybe i even bought it for him 
Anyway, i started to feel bad about that, cause I was afraid that he would use it too rough and not to be so sensitive anymore in sex. I was afraid that he would not enjoy so much with me. It was both stimulating to please him with that, but also i felt jealous and unsecure if my vagina then. And he was not compassionate about my difficult feelings. I needed only to be hold, loved and feel my difficult emotions in safety.
I started to feel so much disgust of him. I hated when he watched porn and masturbated. I felt so much rage. But it was due to my previous traumas (got raped as a young etc). Also, in the relationship there was much mental violence from him.
After therapy, and with new partner I actually bought him some sex toys couple of time ago. And also bought for my previous ex, before the ex i mentioned. And no problem with them! With them i felt safe, loved and allowed to express my difficult emotions too. So, when I felt unsecure, I spoke about it and about my fears, and it truly helps! Now its funny, that I get horny seeing my partner masturbating with a toy but actually he is not so interested in it So i ask him sometimes: could you please masturbate with the toy and let me watch the toys are visible, not hidden at all. He could pick up a toy and start to masturbate but seems not to be very interested in them. Now when finally its totally okay for me! I also noticed it clearly, that he cums much easier in pemetration than with toy or oral sex. So i think my vagina is just good.
I think its important to say what you get from the toy - and what you cant get from it. Why you love to fuck her. What sex brings more.
But: I have a toy hidden! Why? I feel more horny when its hidden, like ‘forbidden’. Naughty. My very own, my real me-time. Private. But also, why i hid only that toy, is that i shame it a little. Its dildo that i can make bigger with air. I love to feel that i can adjust the dildo to fit my pussy perfectly - to feel the stretching but not pain. I feel horny about it. Why i have hidden it and not told: it feels stimulating to have ‘my own secret’. And i dont want that my partner starts to doubt ‘isnt he filling enough’ cause that is not the case definitely. With him i feel fulfillment both in physical and in emotional level. More than alone. Due that, if i want to enjoy much also alone, i need more stimulation than with him. AND cause i train vaginal weight lifting and my pelvic muscles are quite tone and even in pain sometimes due to hard training, its good to help the muscles relax too with gentle stretching. I dont want to bother him too much to massage my vagina, so its easier to stretch alone, i cant massage very well alone cause its difficult to be totally relaxed. I dont make the dildo very big. Just so that it relax my pussy and stretch lovely. If he finds the toy, i will tell him all this. Oh, there is still this… i feel kind of naughty excitement about the fact that he COULD find the toy. If i wanted truly to hide it so that he never finds it, i could do that.
I even have fantasies that he finds it and uses it for me… would be very pleasurable. BUT I am not sure does he understand that my vagina stretch more than his penis. He might think my vagina can take only his penis but nothing more (i am quite tight many have said), so maybe also i dont want to ruin that image. I have fear that he would not get so horny of my pussy anymore, if he knew that i can take a bit more than his penis. Even though: i dont move the toy when i put air into it. I let it be still.
Hope this helped a little.
I’m glad they taught me when I was younger, because it’s really paying off now 
I’m very curious now but I’ve started quite a collection over the last few months and I buy them for myself and my husband 
whose always willing to try something new in my sexcapades