Thanks, BM; glad you liked it, and I expect I'll have further contributions as well, which I hope will also prove to be of interest.
Intensity, determination, and deliberateness...yes, I quite agree.
I also think the detail that I (as well as others) recall with regard to this experience and other important firsts has to do with the psychological and emotional depth of the experience. It's quite literally life-changing, particularly for those of us who experienced that first time as the realization of a long-held psycho-sexual desire.
There's a reason I called part three "Consummation," after all...