It's one of those oddities from the 50s that dances around sex. I encountered it when I was too young to catch the innuendo.

But it was an ok story. and the biology was interesting.

Just checked my ebook copy. It's copyright 1951. It's set in the Viagens universe that much of his SF was set in. But the scientific expedition is pretty much all we see of that.

Most of it is from the view of a few natives. So we get an idea of their culture and history. And get set up for the surprise.

https://en.wikipedia.org/wiki/Viagens_Interplanetarias has some good background and a lot of non-spoilery info about Rogue Queen.