Are women more generous than men....

Some data I came across:

Findings on gender differences in generosity are mixed (Bekkers & Wiepking, 2007) and contradictory evidence exists as to the magnitude and direction of these gender differences (Cox & Deck, 2006). Much of the empirical research that examines the relationship between gender and giving reveals that females are more generous and donate more to charity than males (e.g., Andreoni, Brown & Rischall, 2003; Bekkers, 2004; Carman, 2006; Croson & Buchan, 1999; Eckel & Grossman, 1998; 2001; 2003; Eckel, Grossman & Johnston, 2005; Kamas, Preston, & Baum, 2008; Mesch et al., 2006). However, other research has found no evidence of gender differences in giving (e.g., Bolton & Katok, 1995; Frey & Meir, 2004)—while some research found males to be more generous (e.g., Brown-Kruse & Hummels, 1993; Chang, 2005; Frey & Meir, 2004; Jackson & Latané 1981; Meier, 2007; Sokolowski 1996). More specifically, several studies find that while females are more likely to give, males give higher amounts (Andreoni, Brown & Rischall, 2003; Bekkers 2004; Belfield & Beney 2000; Einolf, 2006; Lyons & Nivison-Smith, 2006; Mesch, et al., 2006; Piper & Schnepf, 2008; Weyant, 1984). Depending on the discipline and methodology used (i.e., lab versus field studies), there is much variation across individual studies as to how demographic and other individual characteristics affect participation in giving--where simple bivariate analysis is not sufficient (Havens, O’Herlihy & Schervish, 2006).

There is more. From another study on that site:

Gender: no differences in total

Might be useful, surprised me to be honest.