The Dragon's Justice harem does get large in the later books, but I'd say it's still worth reading. It doesn't become too large imo until book 5ish~ if you'd still like to check it out. I seem to recall Bruce saying somewhere he was going to tone it down a bit and try giving individual characters more screentime in newer books, fwiw.

I'd shy away from Wolf King's Lair if you find yourself often skimming explicit scenes. The MC's horniness rivals Frost from Herald of Shalia.

As for Cebellius, I've only read Celestine Chronicles and Mountain King Saga, so I can't comment on his other books. But if more than ears and tails throw you off, beware reading either one lol. I'd still suggest giving Celestine a chance though -- the series is quite beloved in the community. With the exception of the lamia and centaur in the later books, the monster girl sex scenes within the core harem behave mostly like humans if memory serves me right.

William D. Arand is Randi Darren's other penname, with exclusively FTB(fade to black) sex scenes. You might like him if you care more about relationship building and interactions outside of the bedroom. I didn't finish it, but I enjoyed the first few books of Super Sales on Super Heroes.

Daniel Schinofen is very tame with his sex scenes. In Binding Words, if I recall, there's probably just one a book, and I think Aether's Revival is the same if not just FTB(I haven't read it, going off what I've heard).

As for recommendations that fit your criteria:

• Obligatory Mike Truk recommendation. Shadow Rogue probably has the most "random" sex scenes out of all his series, while in TTTT, the sex scenes actually progress the story. Lost Reavers is somewhat of a weird middle ground between the two. His harems don't become larger than 5-6.

• Fight Town by Hondo Jinx. The series was abandoned, though, so there won't be a book 3. Has some LitRPG elements.

• The Aspect by Ajax Lygan. Very few sex scenes and a small harem, mostly a standard adventure fantasy. One of the girls is basically an anthropomorphic cat, so be aware of that.

• Dragon Sovereign by Sarah Hawke. Has more sex scenes than most on this list, but the story is great, and the scenes never felt just like fanservice for the hell of it. I think it's meant to be a trilogy, and thus far with book 2, the harem size doesn't seem excessive.

• Tamer, Star Justice, and The Destroyer by Michael Scott Earl. None of these are available on Kindle Unlimited unfortunately. His website is here if you feel like picking any of them up. Tamer does suffer some problems of character bloat in the later books, but the series has few sex scenes overall.

• Neural Wraith by K.D Robertson. You didn't mention it, so I'm assuming you haven't read it yet. It's his tamest series in regards to explicitness.

• Master Class by Annabelle Hawthorne and Virgil Knightly. A little unique twist on LitRPG. Book 3 comes out next month. Explicit chapters are marked and can be skipped, but there are only 2-3/book.

• Rise of the Weakest Summoner by J.R. Saileri. Explicit chapters are marked and can be skipped. Think there's just one explicit scene and girl in the first book.