Infrequently
An elderly couple who are both widowed have been courting for a long time.
They decide it's finally time to get married. Before the wedding, they go out to dinner and talk about how their marriage might work.
They discuss finances, living arrangements and so on.
Finally, the man broaches the subject of their physical relationship.
"How do you feel about sex?" he asks, rather tentatively.
"I would like it infrequently," replies the old lady.
The old gentleman sits quietly for a moment, adjusts his glasses, leans over towards her and whispers: "Is that one word or two?"