1st time

I had never heard of prostate orgasm but was playing with my dildo like I had done 100's or 1000's of times. Laying on my bed completely relaxed and enjoying the sensations. All of a sudden an intense & overpowering feeling of pleasure came over me like I had never experienced before. It was like an out of body experience almost. 

Anyway, it scared the heck out of me because I didn't know what it was or how to control it. Somehow, I was able to stop it about 5 or 10 seconds after it started. I was relived that it was over but totally curious about what just happened. 

I have half-heartedly tried to get back to that feeling many times but it has eluded me for years.