I know and use a solution, which can do all of that, is NSFW friendly and even adult billing compliant (certified by multiple billers).
One major advantage is that you don't need to do your training, and can use an existing content model, as a pay as you go (on a prepaid credit).
You can use it in a browser client, or use API if you'd like to plug it into an existing product (chat, stories, photo, video etc.)
It's coming from someone with a 25+ years track record in the business, and was used in the original premiere AI NSFW project that had some major funding.
A massive, turn key, billing compliant infrastructure.
If relevant, can make an intro.