Philip Jose Farmer and Robert Silverberg are apparently known for putting in... "interesting" sex in their books (PJF even writing a pornographic trilogy for a pr0n publisher, under his own name), so perhaps one of those...
And it's nearly 1am and I haven't found anything useful except that a lot of Classic SF Authors were apparently pretty pervy at times. (No kidding. >_> )
no subject
Philip Jose Farmer and Robert Silverberg are apparently known for putting in... "interesting" sex in their books (PJF even writing a pornographic trilogy for a pr0n publisher, under his own name), so perhaps one of those...
https://hradzka.livejournal.com/194753.html doesn't mention that scene, but who knows about the author...
And it's nearly 1am and I haven't found anything useful except that a lot of Classic SF Authors were apparently pretty pervy at times. (No kidding. >_> )
Good luck!