XX RATED

Each clue below can be answered by a word, name, or phrase containing two X's.
Credit: Will Shortz

1. Giant oil company
2. Giant copy company
3. Woman who oversees a will
4. Spicy southwest cuisine
5. The Mother Road
6. Newsboy's cry, once
7. Familiar sign on an Interstate
8. Horizontal line of a graph
9. Like certain charities and non-profits

Answers:

1. Exxon
2. Xerox
3. Executrix
4. Tex-Mex
5. Route Sixty-Six
6. Extra! Extra!
7. Next exit
8. X-axis
9. Tax-exempt