It's true though, TV series work on the assumption that once a couple get together it's no longer interesting and dramatic for viewers. I don't think that's necessarily true.

Too often sexual tension is forced on characters just because the TV execs think that's what everyone wants, but I like friendship between characters. Not that I'm against romance (Jack/Ianto, Buffy/Angel, Willow/Tara), but why can't characters sometimes just be friends?