Ok not really, but there are times during a photo shoot when you need to change things up. My favorite thing to do is ask my model to “give me the finger.” They usually giggle, or depending on how the shoot has been going will oblige. Either way this loosens things up and gets you some great images!
In addition I would recommend coming up with some phrases that you can say to get a natural reaction. Here are some of my favorites:
“Put your feet closer to the floor”
“Look right slightly, up, back down a little, clench your ball sack”
“Make love to me… I…I mean the camera”
Most importantly HAVE FUN!