I got it as part of the RAINN bundle and opened it up out of curiosity, to see if it was as ridiculous as other D&D "erotic" publishings. I was, however, completely surprised and impressed by the advice and discussions inside. It covers a vast array of considerations, ranging from the role sex/romance can have in a campaign, how you can best employ tropes, how you can organically foster these character connections, and how specific races would view things such as attraction. The writing is concise and frank when it can be, but explains both real world and D&D concepts in a very understandable way. There's a lot in here that honestly would be beneficial to a readers' real world interactions, especially along lines of respecting boundaries. It respectfully and intelligently covers many issues relevant to the bundle I purchased it in.
One of my players identifies as ace/demisexual, but she is playing a classic lusty bard. I was pleasantly surprised to see such things covered. There's so much valuable content condensed into this product, it makes me wonder about the author's background, as it wouldn't surprise me if they literally work in a field that interacts with these concepts.
The art could easily be considered hokey (intentionally so, imitating romance novel cover art), but don't let that dissuade you or make you think this isn't a seriously worthwhile product. I opened it with very low expectations, but now I feel pretty much any DM could benefit from reading through it, if not just people in general. It may leave you thinking more analytically about not just your campaign but the real world and other media, too.
tl;dr: This is surprisngly good and filled with very well-considered advice, informative even beyond the expected scope. Appropriately, this feels like a real labor of love and I recommend it, even to those who wouldn't normally think to buy it.
[5 of 5 Stars!]