There is now a move afoot to replace Andrew Jackson on the US $20 with that of a woman.
The only woman ever to grace US paper currency was Martha Washington, wife of George Washington the first President under the Constitution.
To me, this is a good idea and there are a number of good candidates. Below is a website where you can view the candidates and vote, in the primaries, for three of your choice.
My personal choice would be Eleanor Roosevelt.
http://www.womenon20s.org/
Actually there are some allegorical images of women showing tits and ass on some older US notes.