Just wanted to chime into this thread to give kudos to
@abdlwife2003 for trying to understand and get support and info. I know it can be a real shock for a spouse/significant other to realize things the other is into, especially when it didn't come out clearly during the dating/engagement phase. It sounds like you are doing a magnificent job of trying to understand and immerse yourself into his world, so to speak, even if that world was a secret to you until very recently.
I would just caution you to not rush anything too fast as far as learning and trying. Go slow and don't go beyond what you are comfortable with. Most of all, don't panic and feel like you have to go in deep, all or nothing, in order to "keep" him or remain desirable to him. Looking over your recent posts, it sounds like it was quite a shock for you when he revealed this to you, and now you're dealing with a lot of feelings and maybe insecurities as far as if he's still interested in you the same way, will still want to be intimate with you if you don't ultimately "endorse" his desires when it comes to diapers and using them, will be able to relate to you as before, etc. While valid feelings and insecurities, I would emphasize trying to keep things as "normal" as you are able to, especially with regard to what the two of you liked doing together before his big revelation to you. If I recall correctly, he reassured you that you were still the same couple but you didn't feel like it after hearing this and trying to process it. Do your best to still be the same couple. Don't let this become such a redefining moment that you start changing who you are, just to try to accommodate your perception of who he wants you to be. You are probably dealing with a lot just as far as how you feel about how he kept this hidden and you may be wondering just how well you know him. But I'd advise doing your best to trust him. If he says that to him you are still the same couple, then I would advise really trying to take comfort in that. Don't reinvent who you are just to try to meet what you think his expectation is after not much over one week.
I can relate because while I told my wife in passing about my interests around the time we got engaged, we didn't stay on it long, I probably downplayed it out of embarrassment, and it didn't come up again for quite a few years (roughly 3 years ago now). When it did, it caught her off guard and she went through a wide range of emotions and feelings, ranging from going "all in" to feeling disgusted and wanting nothing to do with it. (Even now there is some tension in this regard and I just wholeheartedly wish I'd been more open up front so as to not have to navigate the whole area of there having been a kept secret and now it's out there and now she has to decide each step of the way what she does with it.) So would just say that even as much as this rocked your world, stability and a slow and steady pace -- not trying out everything in a super short amount of time -- will serve you both the best in the long run.