As for my country (somewhere in W-Europe...) I read that around 1% of all men are attracted to boys, at least to some degree [sorry cannot find the source]. If that is really true, there are indeed many BLs around us - we might meet one per day without knowing from each other. A common sign could be good...

But some reasons contra:
- how to make a "gang" sign public without others getting to know? we are not going to share our feelings with everyone (some would know that sign though they do not belong to this group); on the other hand we would rarely find any BL using this sign if it is secret enough
- socially, we are quite "good" people and no "gang", so why separating from the others who do not know about our orientation? we just live among them as normal guys... in our heart or on this board we share feelings
- most of the BLs we would meet might not be Christians, and thus might have a different view on BL; indeed I believe that C-BLs are not very welcome in the BL-community for their moral values (don't know exactly, but I think so)

Just my 2c

~ Little Tree ~