Thanks for all of the input (pun definitely intended. ). I went and got a medium size rubber one ( how do they determine the size I wonder?) to try out on my slave. So far so good, not only does it make it easier to gain entry for sex but it seems to help put her in the right frame of mind when she is not with me. Any opinions on sizes would be helpful. For right now I think I will avoid glass ones, something about them seems to unforgiving.
Barton.