I have not read Loveless, but the [Fortress series](https://www.goodreads.com/book/show/57017.Fortress_in_the_Eye_of_Time) by C. J. Cherryh is mostly about platonic friendships between men. This is fantasy. The Chanur series by C. J. Cherryh is mostly about friendships between women. This is sci fi and almost every character is an alien so I’m not sure if it’s quite what you are looking for.
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I have not read Loveless, but the [Fortress series](https://www.goodreads.com/book/show/57017.Fortress_in_the_Eye_of_Time) by C. J. Cherryh is mostly about platonic friendships between men. This is fantasy. The Chanur series by C. J. Cherryh is mostly about friendships between women. This is sci fi and almost every character is an alien so I’m not sure if it’s quite what you are looking for.