Usually this occurs because of one of two problems.
Either too small of a butt plug or too much lube.
Now of course, when it comes to anal sex, I prefer too much lube
rather than not enough. The anal cavity is a very delicate place and so
in order to prevent unpleasant things, it is always wise to never insert
anything sharp, always make sure all edges of toys used anally are dull
and rounded. Also, the anal cavity can absorb moisture, so it is always
best to use oil based lubricants as these will not absorb easily and
thus will keep thing lubed up during play. During anal sex or play,
thrusting motions will cause some lube to spread out and thus thin out,
so during longer sessions, it is always wise to re-lube once in a while.
The other reason for this problem can actually be caused by too small
of a butt plug. In this case, you have two options, either a
bigger plug or something to help hold it in. As hard as it is to
believe, some people naturally can easily handle a larger butt plug.
Maybe in your case, you should try moving up to a medium sized plug. If
you can retain it for a period of time without experiencing cramps, your
problem is solved. If not, then your solution might be going back to the
small butt plug, but instead, try using something to hold it in.
Obviously, what I'm suggesting is a butt plug harness, which they sell
here at BDSM Store, you can find them here -
Butt Plug Harnesses
. Butt Plug Harnesses are designed specifically for holding the
butt plug in. Some are designed for men and some for women. Another
option is also to wear a tight fitting thong to hold it in and yet
another wonderful idea is too use a crotch rope, which for women can
also provide added stimulation and sexual arousal as the rope rubs
against the clitoris.
One other thing about butt plugs. Not all butt plugs are properly
designed. A properly designed butt plug will taper out from the top and
then back in again and have a thin neck about an inch long. The base
will be flared out quite a bit to prevent it from possibly slipping up
and inside you. The thin neck will allow you sphincter muscles to close
somewhat around the neck so that they can relax and make it easier to
retain the plug.