I find the concept of growing in love so much prettier than love at first sight?? like one day you look at someone and you suddenly realize you see them in a different light than you did the night before. that’s falling.
How about humans busting out expressions like, "oh my god I'm dying over here", or "four days in the shuttle? I'm gonna diiieeee.", and the poor aliens just freaking out? (And slowly growing to hate the concept of hyperbole.)