Speaking from expierience (and previously the only girl on my former team), team relationships just don't work. They get very ugly, and FIRST is something where you had better be able to get along with everyone on your team, and sometimes relationships cause big issues.
My former team didn't have any relationships (except mine *shudders*).
My new team, nope. None whatsoever (none that I know of at least). Let's just hope it stays that way.
-jill