For ias

[nmg]

From the OED:

frottage

[a. F. frottage rubbing, friction, f. frotter to rub (see FROT v.).]

...

2. Art. The technique or process of taking a rubbing from an uneven surface, e.g. grained wood or sacking, as a point of departure for a work of art.

Comments

[rdmaughan.livejournal.com]

Part of me wants to ask what prompted this exchange. Then again part of me really really does not want to know.

[nmg.livejournal.com]

We had a conversation in the pub on Friday night in which ias surprised us gutter-minded types by pointing out that the smutty definition is more recent, and that there's a definition of the term from the art world which is perfectly acceptable in polite company...