Changing default type size in XFCE's terminal emulator (xterm)

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http://www.linuxquestions.org – XFCE has xterm as the default terminal emulator. Looking at the manual page, I am led to believe that the option -fs should be used to set the type size to something other than the default. However, it seems to do nothing. How do I change the default text size for xterm? (HowTos)