I was never into diapers, or nappies as we call them here. It wasn't that I had any negative connotations about it. I'd just never thought about it.
But last year my husband confessed to me that he'd like me to sometimes treat him as my little/baby girl. He wanted me to smack his bottom and put him into panties and/or nappies and frilly dresses.
At first I was quite shocked. After all, I'd always been brought up to think of the man as the dominant one, so the thought of the man I love wanting to be put back into nappies and treated like a little girl was, to say the least, quite challenging.
But we talked about it, and decided to give it a go.
He has a very stressful job, and he said that this would help him relax.
It did feel very odd having him lay on our bed and let me put him into a nappy, but he was so excited about it that it actually turned me on too. The first time we did it I'd only just got his nappy pulled up between his legs when he came more powerfully than I could remember.
Since then we've both come to really enjoy it, and it's revealed a side of myself I didn't know existed.
So my advice would be to talk to your wife/girlfriend about it. Be prepared for shock and perhaps initial rejection. But if you both agree to give it a go it might turn out to be a lot of fun for both of you.