The Bank of America Merrill Lynch Study of High Net Worth Women’s Philanthropy, the Million Dollar List and the Women Give 2010 studies are expanding the knowledge base about gender differences in giving.

http://www.milliondollarlist.org/blog/2012/february/busting-the-myth-that-women-do-not-make-large-gifts

http://www.milliondollarlist.org/blog/2012/march/busting-the-myth-that-women-do-not-make-large-gifts---part-2