1 Peter 2:16 TLB You are free from the law, but that doesn't mean you are free to do wrong. Live as those who are free to do only God's will at all times. I have added the scripture for reference.
So there is freedom in the marital bed but it doesn’t mean everything is holy or good to do. It’s something you and your husband should seek the Holy Spirit about. Personally, I don’t think using a dildo on your husband is holy as it sodomizatuon and simulates homosexual sex. I would never open that door personally and I would find it suspect if my husband was okay even trying that. Sex in marriage is meant for you both to enjoy each other’s bodies. Toys (depending on what they are) can be a slippery slope into ungodly practices. If you want inspiration Song of Songs is a good book to study as a married couple concerning intimacy
I’d avoid pegging . And explore why that experience is wanted in a marriage. Falling into our desires instead of making love together
So I highly recommend you check out this Christian sex blogger, Sheila Gregiore. She wrote a really good article about using sex toys and whats allowed or not. Because Christians have the burden of being expected to be private about things. We have a hard time getting advice on anything a little bit kinky. I think she would say that this is between you and your husband, and only God has another vote. Not anyone else! I think a lot of conversations about the whys behind your wanting to explore this particular direction. And then if you are both agreed to try it, go slow. Research about it and talk through why it might be a positive or negative thing. And why each of you might enjoy it. If you are afraid of doing something that God would frown, y'all should fast and pray about it. He'll reveal himself and give you a push, whichever way he wants to show you. Personally, I'm not very adventurous, but I love my husband and he sometimes has ideas. Also an important part of the conversation is, full consent. If
Either of you, doesn't want to do anything sexual, then that's the boundary for your particular relationship. Coercion or feeling obligated to, has no place in a loving relationship. And just because you are married, doesn't take away consenting to sexual activities. (I had to add that, because some Christian circles teach that wives can never say no. Not without intense guilt and rebukes.)
This is of my personal opinion and experience but maybe a verse in scripture which can speak to this is 1Peter 2:16. It doesn’t talk about sex but talks about what our freedom is in Christ. I would clarify by saying, there’s a thing with lust, which is simply the desire of our hearts. When we give into it no matter the institutional protection; being marriage, it could drive us to do something else. The real reason we get married shouldn’t be because we can then express all our sexual desires, yes we can but in everything always ask yourself if this pleases Christ, that’s why I mentioned the scripture 1Peter 2:16.