Dating any Co-worker distant or near is just a BAD idea.
Swishy Femme or Masculine Might, Its still a bad idea for all.
Oogle over him to yourself, but don't cross the line.
I don't constitute bumping his knee a sign. I do see that YOU are hoping its a sign to get in his pants.
I work in a large corporate world, and I have my daily temptations too, but I know that it's better off left alone.
DUring christmas, our group went out to dinner. A straight co-worker was messing around, and grabbed my inner thigh - 3 times. Each time he got closer to Little Jim and the twins. Third time was the charm and he accidentally brushed my balls, then he was like OOPS! Sorry man! We laughed about it, but he told me after the fact that, he was Frightened because I DIDN'T jump... (He doesnt know for sure that im Gay), and he was happy that I didn't grab him back.
Is this a sign? NO. It's a co-worker thats stepping over the line, because your still "At Work", with your co-workers.
The group already covered it. You want to get a hot encounter - then cruise Gay.com or your local adult bookstore.
C