For the unmentionables that are obscene and not heard
It's great stuff, swearing. It stiffens the sinews and speeds up the blood, and not just metaphorically. Obscenities act on us physiologically: swearing increases electrical conductance across the skin, pushes the heart rate higher and increases resistance to pain.

by Melissa Mohr
OUP
It's great stuff, swearing. It stiffens the sinews and speeds up the blood, and not just metaphorically. Obscenities act on us physiologically: swearing increases electrical conductance across the skin, pushes the heart rate higher and increases resistance to pain.
Obscenities are also linguistically interesting: the more currency they have, the more their emotional colouring and the associations they trigger overwhelms what they actually mean. "F******", these days, only sometimes means "having sex".
Swearing doesn't just mean what we now understand by "dirty words". It is entwined, in social and linguistic history, with the other sort of swearing: vows and oaths. Consider for a moment the origins of almost any word we have for bad language - "profanity", "curses", "oaths" and "swearing" itself - and the connection is clear.