Vivid Entertainment is marking the 10th anniversary of the debut of “Kim Kardashian, SuperStar” by declaring March as “Kim K Sex Tape Month” and offering discounted memberships.

In an event sure to shake up the tissue and hand lotion industries, a group of the world’s largest adult entertainment companies have come together to announce #FreePornDay, to be held September 8, 2016. On this day, porn fans worldwide can access virtual...