Image#1 - Statue of David. While true this statue actually displays the full male anatomy, through out time most statues either had, or later added a fig leaf to cover them up. And during some reins of power, and occupiers of country had the penis either removed completely!
Image#2 - The female form today, specifically the breasts continue to be shunned and/or covered up. Indeed, many social media sites (thanks Ello for not being one) prohibit this exposure of the breasts, more specifically the nipples. Even the once free an open topless beaches of Europe are now reverting to a more prude stance.
Image#3 - An obvious big issue in America right now, specifically same sex couples. Not only does this photo represent two women, but one of racial diversity as well, sadly still frowned upon in many countries in this day and age.