Getting a good photo-j pose is like hitting a golf ball. You need a good follow through. If you put someone in a pose, and say "look candid", it isn't going to work. You have to get them in the middle of what they're doing, and they should be doing it in a natural way. I tend to watch the couple like a hawk and shoot all day long with them. That's one of the keys to being a photo-journalist, being able to photograph someone all day without getting massively into their space. It's a skill that takes a long time to develop.
A good way to break the formality is to get them walking, running, etc. And not at a controlled, easy to shoot pace, I mean full speed. I'll yell directions at them when they're doing it, like "hug her" , or "kiss her", but I at the same time, I tell them not stop walking or running when they're doing it. Like the golf swing, you're only hitting the ball for a fraction of the swing, but the whole thing counts.
David Buzzard 
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