Yeah, the physicalness gets to me after a while. I'm like, don't touch me! Just get off me! Luckily my husband likes to rough house with them, though.
They can really hurt you sometimes.... I have to brace my whole body when my DD comes running to give me a hug, or I'll land on my backside. and she has almost choked me more than once, actually bruising my windpipe one time. It hurt to swallow for a day or two afterwards.
I try to remember that they don't mean it, and just be grateful that they are at least affectionate. It would be so hard to have a kid who never returned any of your affection.