I have to tell you if you have not found the male G spot...Also known as the prostate! Once found and effectively stimulated it is one of the most incredible orgasms you will ever have!
During some lovemaking with my wife using a dildo in my ass, she got it right on my "P" spot. The orgasm lasted....gee....I can't even tell you how long as she sucked my cock I had a constant flow of seminal fluid, and it felt amazing. It was more like cumming, without the normal orgasm. As this went on the waves of sensations kept building until I finally had an explosive orgasm!