My experience of drawing and the way I was taught one had to look analytically and render lines, values, shapes.
well, yes, of course. i'm sort of unusual, and i'm well aware that i am the exception to a good many rules in artistic areas. my drawing process relates entirely to light and shadow. on good nights, i totally disconnect from any cognitive process (ie: "this is a hand! and that's a finger!") and just focus on what things look like.
since attraction and sexuality are very low in the hierarchy of conciousness, i find that just a little bit helps to hold my attention. i tend to draw better when i find things asthetically pleasing. you'll find similar things in photographers (also a member of that group) in that they attempt to make even ugly things pretty.
It used to amaze me that when I would step back that there would be a drawing there and I would wonder who had done it for all I had done was try to render relationships onto the paper.
i don't really think i draw. because when i do it well, i've shut off my concious processes, and done it entirely mechanically and subconciously. when i think about it, or can't focus into the proper mindset, i can't draw at all.
Drawing seemed to me a very abstract thing and if the model was a woman I found very attractive it was hard for me to let go of her totality the gestalt of which was "beautiful desirable woman" and instead look to the particular abstract shape of the shadow, or the shape of the highlight on her breast, or cheek, or the apparent angle of her shoulder to her neck and thus lose my awareness of her body, momentarily, as a total and instead analyze what I was visually seeing.
i taught myself years back to see a totally different way. so i can (sometimes) shut one way of seeing off completely, and usually totally at will. i say sometimes because about half the time i just plain suck. but it never seems to have much to do with attraction, since we used the same models for long stretches of time.
Perhaps you draw differently, maybe they are teaching drawing differently?
the first option. my experience in art classes is that i've ignored what most of the teachers have taught, and drawn fundamentally differently than most of the students. for starters, i'm about three times as fast. i had one teacher that did teach differently and i blame it on her even though i don't follow her method exactly.