I wouldn't say the impulsive response to seeing a female is to think "I'd like to f*ck her"... For me, it's more of an objective (well, really, subjective-but-detached) rating of her attractiveness, as well as a possible itemization of what features I find attractive about her.
Should she score highly enough, then, yeah, my next thought might be "Yeah, she's f*ckable." Still doesn't necessarily involve the desire to act on that, however fleeting.