I've experienced the same thing, Sharni, but it's only ever happened when I'm on my back. Though I will be trying Lilith's suggestion as well.

__________________
I see your fantasy... you want to make it a reality

Are you in the mood to be subdued

You see these shackles
Baby I’m your slave
I’ll let you whip me if I misbehave

Tie me to the bedpost

I like it rough
cause I'd rather feel pain than nothing at all