In my personal experience, X while on was terrrific. No abnormal sides noted, just do what you would normally do (keep cool, fluids, etc.)n
The thing to note, as others have said, is X is not the problem. It's the 8 out of 10 pills sold as X that contain other junk that can be extremely dangerous. That's why the stuff's got a bad rap, and hardly anybody does it anymore when it's arguably one of the safest and most fun rec drugs ever created by man. The fake pills mess you up, but if your eyes aren't shifting and you don't feel it in your jaw, then it aint MDMA.
And as far as doin it with your wife goes...there aint nothin better to bring a couple closer together. I got to where I just about couldn't stand to be around my wife anymore because she always pissed me off and I wondered why she couldn't be like the girl I dated. But after a night of X, we got to know each other again.
I say it's a risk worth taking if you believe the pills are MDMA.