Welp, time to see what this Sherlock thing is all about
You can just tell that they're mentally f*cking each other.
Aside from the apparently homoerotic overtones, I mean. Seriously, spend five minutes on Tumblr and you'll be convinced that they're in a committed relationship, and Steven Moffat and Mark Gatiss are just trolling the fandom.
Then again, Tumblr is convinced that every fictional male character is gay. They take their shipping very, very seriously.