Comics have the bad habit of generating very little useful discussion (this one is no exception) and of being generally fairly shallow examinations of any topic.
If you want to talk about the issues discussed in this comic, how about writing a blog post that links to the comic instead?
It's saying that sexuality is usually shown as being black/white, but actually there are many shades of just not grey, but also green, blue, and purple.
Shall we start posting every xkcd too? They're pretty awesome and very much on-topic.
What about Penny Arcade. They're pretty cool too, and very geeky.