What are some good dark romance books for beginners?

If you don't know me, I absolutely love romantic books/novels! Lately I've heard about dark romance books but was warned that some aren't for beginners. What are some series that I can start off with? I'm not sure if I like dark romance books or not, but only one way to find out. But I have my book list ready to write down.

What are some good dark romance books for beginners?
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