You are 100% right:
Amendment XIX.
1 The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex.
2 Congress shall have power to enforce this article by appropriate legislation.
The question is, what are you going to do about it?
Wake patriots up by encouraging them to read Free Republic. They can then exercise their voting muscle to politically force the corrupt federal government back into its constitutional Article I, Section 8-limited power cage.