My s/o and I have a very playful and laid back relationship, and sometimes we'll laugh while doing stuff; whether it be from a random joke that one of us decided to tell during foreplay, a funny facial expression, or from teasing each other (he's over a foot and a half taller than me, so he always has to make a joke about that). We seriously end up laughing at each other at least once everytime, it never fails. The best part about this is that we feel more connected to each other and it makes everything so much better because we're genuinely happy.