"The data show that 70% of working men and 59% of working women are sports fans" [1]
"74.6 percent of all male respondents consider themselves football fans as well as 51.5 percent of all female respondents."[2]
"...according to data from The ESPN Sports Poll and the U.S. Census, with league officials saying 44 percent of all football fans are now women."[3]
2: http://www.statista.com/statistics/208431/football-fans-by-g...
3: http://espn.go.com/espnw/news-commentary/article/7536295/nfl...