There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Well, we do have B-rex who was confirmed to be female via fossil medullary tissue. But it's not exactly very big, at ~10.4 meters and ~4 tonnes, so if anything it would support females=smaller. That 'females=bigger' theory is not exactly in line with information we do have.
In all honesty, we don't have a statistically valid fossil sample nor enough fossil evidence to figure out the difference between male and female T rex, and probably never will.