You know, I played through ME2 with a femshep - selected a Liara romance with the comic, but moved on to Thane - and I don't recall any "thirsty" behavior around Jacob. Maybe I just have a different standard for that.
You know, I've been trying to locate the scene I think people are referring to but hilariously enough when I attempt to find it through Youtube's search engine, it provides me with videos about Shepard and Garrus especially romance videos as the top videos.
This is despite none of my search words being anything related to Garrus or even romance. I even tried to narrow it down by adding dialogue but that only made it completely remove Jacob's videos except for two near the bottom.
Poor Jacob, it seems like Youtube cares so little for and about him that it actively tries to avoid people watching videos with him and his scenes. It's like it holds a personal grudge against the man.
Note: My search words were "femshep jacob mass effect 2" and "femshep jacob dialogue mass effect 2".