Not as crazy as it sounds
The billions of $$$ Americans spend on pornography (most profitable business on the Internet, btw) must mean something, and porn is a significant social and psychological phenomena worthy of bona fide academic research and publication.
I must wonder, if there is an ETI out there somewhere, do they share the same social taboos, and personal obsessions with images and sounds depicting, or derived from, their basic act of procreation?