You ever notice how we freak out if there's any nudity in a movie? We slap anything longer than a brief glimpse with an R rating, and if has any semblance of explicit sex, by god we throw that thing in the far corner of the video store and people blush when they go in or walk out of that section.
Porn, frankly, doesn't do it for me...
But when did we decide that something that is as natural and instinct driven as eating, breathing, sleeping, or excreting should be hidden an shunned, while we idolize criminal acts such as burglary?
"We train young men to drop fire on people, but their commanders won't allow them to write fuck on their airplanes because it's obscene!"