For TLBibson:

For squeezing, I like to make the deal with my wife that as long as I can continue whatever I am doing, it is nowhere near too hard. She can go that hard and a bit farther. My favorite is the 69 squeeze. I have my face in her pussy and she is squeezing and biting my balls. At first I was able to keep licking. After several sessions, she progressed to squeezing with me burying my nose in her pussy and yelling (almost as good as a vibrator according to her).