For #3 see 'Gender Differences in Personality and Interests: When, Where, and Why?'[1] The difference between being thing-oriented and people-oriented is larger than the things we think of as obvious gender differences like physical aggressiveness or attitudes toward casual sex.
"For the people–things dimension of interests, the results in Table 1 are clear, strong, and unambiguous. Men tend to be much more thing-oriented and much less people-oriented than women (mean d = 1.18, a ‘very large’ difference, according to Hyde (2005) verbal designations"
"For the people–things dimension of interests, the results in Table 1 are clear, strong, and unambiguous. Men tend to be much more thing-oriented and much less people-oriented than women (mean d = 1.18, a ‘very large’ difference, according to Hyde (2005) verbal designations"
[1] http://sci-hub.cc/10.1111/j.1751-9004.2010.00320.x