I had been masturbating for many years before a) getting a hard on and b) ejaculating. The sensations I felt once I was masturbating my hard penis were overwhelming and the wave of ectasy as I "came" wore me out. The first time semen actually came out wasn't a surprise, I was expecting it, but I didn't write it down in my diary. I learned pretty quickly, however, how to throw my legs over my head and pump my cum into my waiting mouth