Sex has always been (well at least for America, and a few other Christian oriented nations) something you don't talk about, but do behind a closed door. The whole, "Sex is a sin," bit and human nature is always drawn to the contrary. Once fear of it is gone, we'll probably see less of it just because the mindset will shift from, "Gasp! Sexual display," to, "Oh, another couple screwing in the park." We can thank the Dark and Middle ages for this mindset (damn religious leadership). We're animals, we have drives (hormonal or otherwise), so our species as a whole should just get over it. Heh, it could be said that in Freudian terms, humanity is in the genital stage of its overall growth. So, for a species that's about 20,000+ years old (speaking of the modern, city shaping sapien), we're only teenagers in the whole of the galaxy.