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@ZuricoDrexia For Indexing you need to understand few question

1. Is my Internal structure Good? use - Screaming frog
2. Should have content means no Thin Content Pages
3. Internal duplicate content issue. You can have internal duplicate content which is normal but it should not be more than 30% look at my website. htttps://www.thegirlscurls.com

I have also the same issue i was trying to rank my main keyword Call Girl in Delhi but no luck i followed above step and now it's fine

Doing SEO on an Escort Website is very hard and the reason you shared is pretty correct. I have started a website named - thegirlscurls.com. This domain was a fresh domain. My Target Keyword was Call girls in Delhi.

For Backlinks :

1. Find Forums using Search Operators.
2. Do the relationship building
3. When you spy on your competitor you can easily make search operators gain new opportunities for backlinks
4. Try to buy an Adult guest post

I have achieved 8k organic traffic in 3 months and it's increasing month by month