One thing it seems most of the comments replying to are missing is that women are trained, in the US, to be "nice", emotionally observant, and socially fluent.

One thing it seems most of the comments replying to are missing is that women are trained, in the US, to be "nice", emotionally observant, and socially fluent. Even throwing innate differences to the wind, watch family interactions and see four-year-old Lucy get reprimanded for not hugging Grandma and four-year-old Lionel not hugging Grandma and everyone laughing and saying, "How cute, little man!" and giving him an out (a wave, a handshake). Through the power of social ostracism women have learned to act nice and be emotionally observant even when they don't feel it. Guys have their own pressures, of course, starting with the basic "don't cry" and "man up" and going from there. Imagine Lucy and Lionel scraping up their knees mildly on a rock: Lucy will get a lot of cuddles and hugs when she cries, and Lionel will be treated rather differently -- a range of responses from a briefer hug to "You're fine!" This definitely influences peoples' ideas of appropriate interpersonal interactions.