Why did she open her legs?

I used to work with this coworker that had me all kinds of flustered. She would randomly do things that would turn me on but it looked like she didn't mean to. We were working alone one day and she was sitting in a char facing me while she was on her phone. She was wearing shorts that were kind of loose, so I could see almost everything. She looked at me and then opened her legs and just stayed like that but didn't say anything or look at me again.. why would she do that? Did I miss an opportunity by not doing or saying anything?
Why did she open her legs?
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