Progasm to small?

Hey all,

Yesterday I received the Progasm. I never did any prostate simulation, or any other anal things. I am however a bisexual male.
I only read about the progasm being to big, or hard to insert. I noticed none of this. I can even insert him without any lubrication if I want to.....
And when it is in, I don't need any time to recover or time to relax, since I just don't feel it anymore right away.

So I've been reading the techniques and experiences, and none of it is working. I do not feel any stimulation (Or I have to do it by hard, and even then there is nothing orgasmic about it).
I've been laying with the aneros inserted for quite some while, been doing contractions, changed stances and even slept the whole night with the aneros in. But nothing, no stimulation....

So hopefully you folks can give some advice, or is this really just ain't gonna work for me?

Thanks in advance!