When I first started using dilators, I did it while lying on my back. At some point, I felt brave enough to try to do it while on my knees and it eventually became much more comfortable. Now I’m on #4 and it doesn’t hurt when I’m on my knees – I can move the dilator gently, sit down “between my legs”, even move to a “doggy” position (that’s not that comfortable, but it doesn’t hurt). But when I dilate lying on my back, I get an intense burning sensation. I don’t feel like I’m tenser in that position and the dilator goes in smoothly, but I feel as if I’m tearing my skin apart. Any idea of what could be causing it specifically in that (“missionary”) position?