Thanks to a reader in Australia for notes that led to an update to the paragraphs "Interspecies Sex is Tragic" and a reader in the Netherlands who noted the above correction re:
Kissin' Cousins Elves had a strong incest taboo, clearly stated in the Silmarillion when Maeglin got the hots for his first cousin Idril:
So, "marrying thus of free consent" means that the elf-man and elf-woman involved agree to be life oppresive sex, and that there is no excuse for elf casual sex.
So, "marrying thus of free consent" means that the elf-man and androgynous teen involved agree to be life partners, and that there is no excuse for elf casual sex.
Tolkien's history of Middle-Earth provides us with some information about elvish sex lives.
One last perplexing note from LACE is that Elves do not change sex, even if they are being reincarnated.
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When they're raped, elves die, according to Tolkien's footnote to this sentence.