Many opponents of LGBT social movements have attributed their indifference toward homosexuality as being a result of the immoral values that it may instill in children who are exposed to homosexual individuals. In opposition to this claim, many proponents of increased education about homosexuality suggest that educators should refrain from teaching about sexuality in schools entirely. In her book entitled "Gay and Lesbian Movement," Margaret Cruickshank provides statistical data from the Harris and Yankelovich polls which confirmed that over 80% of American adults believe that students should be educated about sexuality within their public school. In addition, the poll also found that 75% of parents believe that homosexuality and abortion should be included in the curriculum as well. An assessment conducted on California public school systems discovered that only 2% of all parents actually disapproved of their child being taught about sexuality in school.