Sherlock: What do real people have in their real lifes?
John: Friends...People they like, people they don't like... Girlfriends, boyfriends.
Sherlock: Like I said, dull.
John: You don't have a girlfriend?
Sherlock: Girls, not really my area.
John: Alright... Do you have a boyfriend then?
Sherlock: Sorry?
John: A boyfriend? Which is fine by the way...
Sherlock: I know it's fine.
John: So you have a boyfriend.
Sherlock: No.
John: Fine, okay... You're unattached, like me. Fine... Good.