I feel for the actors who have to portray Klingons especially with the prosthetic teeth. But can you imagine getting into an argument with a Klingon partner? Come on. Klingon is the science-fiction equivalent of Welsh: you need about half a litre of phlegm in your throat just to pronounce place names. Unfortunately, the exaggerated and pronounced nature of Klingon incisors means that the phlegm is expelled at the other partner's face. Who wants that? Based on a Klingon's less-than-peaceful nature, you know that a heart-to-heart conversation with a Klingon significant other is going to end up with you drowning in dribble. Of course, if you're lucky, the conversation will be gak'h-free.