Exchange

[Sarah]

The process of setting accounts or debts between partiesresiding at a distance from each other, without the intervention ofmoney, by exchanging orders or drafts, called bills of exchange.These may be drawn in one country and payable in another, in whichcase they are called foreign bills; or they may be drawn and madepayable in the same country, in which case they are called inlandbills. The term bill of exchange is often abbreviated into exchange;as, to buy or sell exchange.

[Dave Paprocki]

Performing [oral sex] on [someone] of the [opposite sex].