When you're on top, have your partner move into a sitting position. Now, your partner isn't going to want to "motion of the ocean" the entire time, but going from easy grinding to hardcore cardio will make this position a lot less strenuous and a lot more fun. Good for them being able to get all the way through it. No one is going to force you to exert yourself when you're dealing with a "bad back. This way, you've distributed your weight evenly while adding a little extra balance. And I can never orgasm. Tip 9:
Every single minute you last is one step closer to looking like Gisele Bundchen or Kendall Jenner.
I stand by that. When in doubt, just say you have back problems. Put both hands on your partner's ankles.