Well, there are ways to ease your wife into getting kinky, it just starts with the bedroom and gradually stepping up the kink game. For example...
Disclaimer: This might come off as manipulative, but we both enjoy what we're doing and I'd never force my girlfriend into doing anything she's uncomfortable with. We're very open to each other about each other and have been dating for 2 years.
Stage 1: the virgin girlfriend. When I first met her. I was the first person she's had sex with. She LOVED it and wanted to do it regularly.
Stage 2: I introduced that I had a 'kink' for women in nylon stockings and tights (post history checks out) and I bought her a couple pairs which she at first reluctantly wore for me every so often and occasionally sent me a picture of her wearing them.
Stage 3: I admitted that my 'kink' was actually a full blown fetish. We're super comfortable with each other now and I offered her a ton of positive reinforcement for wearing stockings and tights for me (foot massages, leg rubs in public, more affection) and she started wearing them nearly all the time for me.
Stage 4: Started hinting at the idea we take sexy pictures together. So we had a lot of NSFW selfies (not of us having sex, just her in lingerie and me kissing on her and stuff)
Stage 5: now she loves sending me full blown nudes regularly and wears stockings or nylon 80% of the time we're together. I asked her if we could take pictures while we have sex, she was into the idea. During one of the pictures I "accidentally" pressed video record and recorded 30 seconds of us doing it. I played it back for her after we were done and told her I'd delete it right then and there if she wanted. She thought about it and said I can keep it but I have to be careful with it.
Stage 6: She then admits to me that the clip I took of us was hot and watching us have sex is a total turn on for her, I suggest we film for real next time, she tells me she's been considering it for a while. Now she wants to film an amateur porn video.
That's where I'm at now. Of course that's over 2 years of trust and a healthy, happy, relationship. With that foundation already established in your relationship you can breeze through something like this within a couple months.