Quote Originally Posted by sinfulsex View Post
its weird somedays i can take it, i have found before that i just couldnt though

very bizarre - anyone else found this?
Your post is of high value, dear. i have similar experience when kneeling on rice. Sometimes it seems unbearable. Sometimes it goes rather smoothly. The difference must be in my knees, because the rice is the same. The nerves work with different intensity, i suppose.

On erogenous zones, of course, your erotic tension can be a decisive factor.