Then you are indeed old school, because sex positivity is awesome. We have all seen dicks before and we have all seen vaginas before, people use these to make sex. We know that people close to us have had sex because we exist, everyone's dad has fucked everyone's mom. Get over it
You're not. The majority of people feel that way, but it's mostly quietly though since saying otherwise publicly would be construed as being 'sexist/misogynistic/puritan/etc/etc'.
Only a tiny fraction of society actively engages in social media. Remember that.