I guess I'm not sure. I mean, it's not like I went from being a kissless virgin to suddenly some chick steps out of the closet fully nude for me. You see bits and pieces as a part of the natural progression of sexual exploration during adolescence. Start rubbing a chick's tit while making out one day, a couple days later you have her shirt off, then more days pass and you get a hand in her pants, then her pants come off, then later you've got it all off at once, but even then it's not like there's a point where you stand back and you're like "let me take this all in".
I tell you one thing though, the first blowjob is disappointing as fuck. You've gone through your whole life jerking off, knowing exactly when to speed up, slow down, work the head, squeeze it tighter, imagining how great it is to have those wet lips and tongue wrapped around it instead, and then when she gets there she has no goddamn idea what you want her to do. Like, she gets the basic mechanics of it, but she never knows what you want like you know it.
It gets better, but still with my first GF it took her three tries, three different nights, to actually get me to come in her mouth,