The second attempt brought slightly more success, although I fear I am a long way from the elusive anal orgasm.
The key definately seems to be arousal. Although horny, I wasn't erect when I inserted the MGX, and found it difficult to achieve an erection once it was inside. There was however a lot of pre-cum again. After much manual stimulation I became hard and it instantly felt different. The head of my penis was much more sensitive, as was the shaft. If this felt so amazing I can't wait for the "real show" to begin!
This time I didn't have the urge to defacte, but really felt I needed to pee, does this mean it was postioned correctly, and pressing against my prostate?
I probably (!) shouldn't have, but at this point I masturbated to completion and had a very satisfying wet orgasm. I wouldn't say I produced more cum than usual, but my penis was (and still is, half an hour later) more sensitive than usual. Something definately felt different when I was erect. Enough to encourage me to continue on this journey.
So, I'll will keep trying, playing and enjoying …
Peace, love and good happiness stuff