Way back when, illusion released a game called rapelay. Eventually, this game made it into the hands of some over-privileged twit in the west that made noise and dragged it into the hateful eye of the public opinion. After that, japans' eroge companies had to block non-japanese IPs for some time, there was so much harassment. That was the first blow to the industry and since then there was a significant drop in BDSM and other hardcore content.
Second time was when it became politically correct to hate loli genre and call those that liked it pedophiles. Now most female characters have cow tits.