Why does my jaw "shift" while giving oral sex?

I am a female that used to be able to give oral sex with no problems from my jaw. Now, when I try to do it, my jaw "shifts" when I take it out of my mouth. It is painful and uncomfortable. There was also a time when my jaw would make a loud cracking noise when I chewed, but that only lasted for about an... show more I am a female that used to be able to give oral sex with no problems from my jaw. Now, when I try to do it, my jaw "shifts" when I take it out of my mouth. It is painful and uncomfortable. There was also a time when my jaw would make a loud cracking noise when I chewed, but that only lasted for about an hour. When I open my mouth as wide as I can it kinda hurts. Can some one please help me with a solution to this problem? Why is this happening?
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