Are there any classic psychoanalytical essays/books that talked explicitly about sex, especially male lust, in terms of its imposing interior unconscious desires onto an exterior object or person?
I know this is almost a fundamental assumption in psychoanalysis, that the psyche constructs its internal reality and imposes it outward, but I was hoping to find explicit statements and (ideally) methodology.
You won't get what you're actually looking for.
You're looking for a book which explicitly gives you a description of the psyché behind sex, there is to this day none since the only domain looking into that is the freudian psychanlytic method, so follow anons advice and read Freud, he may give you his position on the way things are based on his own observations and conclusions.
Read it with a certain distant view, you may enjoy his thinking or hate it. Depends if that was what you were expecting. In both cases, it's a nice beginning since he's got a definitive, constructed opinion on the subject. Then if you enjoy it, follow the psychoanalytic lead about the subject, if you don't, search for philosophers about this.
>terms of its imposing interior unconscious desires onto an exterior object or person?
Freud thought the libidinal drive was pleasure seeking. If you want to read about the object seeking drive read Wilfred Bion and then maybe Fairbairn and Winnicott.