Sexual tension: does it take two?

Anonymous
You hear a lot about there being "sexual tension" between two people. Though I believe there is such a thing, I'm curious as to whether or not you guys think both parties can feel it when it's happening, or if it's just one-sided. That probably didn't make a lot of sense, so here's an example to illustrate:

A few months back, I was having a discussion with a good female friend of mine. This particular female friend, I had previously expressed interest in/asked out/kind of got a thing going with, but it never materialized into a full relationship. I'm fine with that, that's not the point. The point is, we were talking about something completely unrelated (her family, I believe) and I started to feel this overwhelming feeling between us, a feeling I can only describe as sexual tension. It felt like we were both feeling kind of an intense desire for each other, and that I could have leaned in and kissed her then and there and it would have been okay. It's important to note here that, at the time of this conversation, I had gotten over any strong romantic feelings I may have previously had.

My question then, is this: I know I felt that, but did she feel it? Does this kind of sexual tension need both parties to feel that desire for each other, or was I just imagining the whole thing?
Sexual tension: does it take two?
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