Trying to summarize the behavior of half the world population is pointless. Different women look for different things in their partners. For any woman who likes a dark haired, soft spoken thoughtful guy, there's one looking for a blond passionate and outgoing guy.
The criteria are endless, and intelligence is too broad to measure. For example, wearing glasses is associated with being book smart and nerdy, so typically would be a marker of low social intelligence.
From my own experience, people in healthy relationships basically look for a friend they're physically attracted to. Your mileage may vary.