Why does one resurrect the metaphor 'fuck' in connection with something that is 'fucked up'? [...] Thus, why in our everyday life do we find that in our metaphors a certain type of meaning is involved, certain signifiers that are marked by their primitive use in connection with the sexual relation? Why, for example, do we use some sland expression that had originally a sexual significance in order to evoke metaphorically situations that have nothing to do with sex?
- Lacan, Jacques. The Seminar. Book VII. The Ethics of Psychoanalysis, 1959-60. Trans. Dennis Porter. London: Routledge, 1992. p.168