a masturbator said:

Not without some embaressment I recently purchased a flesh coloured
sleeve designed for male masturbation.
This is the first time I have purchased such an item and I thought I
would share my thoughts.  It was much cheaper than the larger models
and I thought it would be a good place to start.  Some of the larger
models look great but can be expensive.
The one i bought was only about 4 inches long with a couple of moulded
lips at one end – could be seen as vaginal or facial lips I guess.  The
material really is quite tactile and nice to hold and squeeze. 
Somewhere between firm and soft but spongy and giving like real flesh. 
Colour was flesh pink.  The cicular hole in the sleeve looked way to
small for a penis…only about the diameter of a pencil.  I thought I
had wasted my money as my penis is fairly thick.  However the amazing
thing is the material is so stretchy and pliable that the erct penis
can be forced thru the little hole with a little effort and once the
precum starts flowing the whole length becomes lubricated and can be
pumped up and down with the knob popping out ion the downstrok and
being completely encased on the upstoke.  As a newcomer i found the
elasticity of the sleeve realistic and nicely tight but almost "too
tight" for me.  A real vagina is of course an amazing thing and is very
elastic and can accomiodate all size cocks – but generally doesn’t grip
this tight!!
The item had 2 cute little handles on each side allowing you to hook
your thumb and finger into each side which helped with the grip and
prevented loss of grip when the precum was flying and the whole sleeve
became wet and slippery!  I originally was hoping to use the device to
ask my Chinese massage lady if she would let me "practice" my hip
thrusting (thanks richard for that humiliating idea in an earlier
email) whilst she firmly held the sleeve and these little handles
appealed for that reason.
On the downside I think it is too short for me as I could not get a
sense of being "engulfed" by the vagna as either my knob protruded at
the nend orif I covered the knob then too much shaft was not being
squeezed by the sleeve "flesh".
I therefire suspect that the full length artificial vaginas will give
greter penis engulfment" but i will need to take care to buy one long
enough to take the full length of my erection.
As an aside, I rether prefer the concept of Germaine Greer who has
always argued that a woman’s vagina actively engulfs the penis rather
then agreeing that the penis is active in its penetration aspect.  A
subtle but empowering idea both for women and for submissive males who
may struggle with the idea proposed by some feminists that sexual
intercourse is a form of penis aggression against the female and
constitutes a form of rape.  The submissive can then understand that
his erection is necessary to allow satisfaction for the female vagina
which needs to engulf and bear down on, almost "absorb", the male penis
for her to feel satisfaction.