A new study in the Journal of Politics by Andrew Healy and Neil Malhotra finds that young men who were raised with sisters are more likely to express socially conservative views on attitudes about gender roles.
"Having sisters makes males more politically conservative in terms of their gender role attitudes and their partisanship. Particularly for gender role attitudes, we find that these political socialization effects persist until respondents are well into adulthood."
The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. John Kenneth Galbraith