Why do porn sites have social media sharing buttons?

On Reddit, the question was asked, "Why do porn sites have social media sharing buttons?" It's a good question!

The Next Web presented some of the most plausible answers:

Because while it would be immensely embarrassing for you, itd still be great advertisement for them, one commenter says. Realistically, nearly every blog standard CMS framework comes with them on out of the box these days, another argues. Most sites probably just dont turn them off.

One user suggests that its probably there for people who post porn on Tumblr or Redditwhich makes sense, as they are places for embedding images and videos that offer greater anonymity.