I'm cleaning my peppered colony right now so they're all in a separate container; I noticed one of the males smearing this clear goop along the bottom, a few nymphs and females checking it out. Another male came up, checked it, then started moving towards the male who put it there. There was a bit of face-to-face pushing, a small amount, and mostly just "staring." Just an odd observation.

That's really cool! It's always fun to observe "new" behavior with roaches. As for the question, I don't know if A. tesselata is a territorial species or marks it's territory, but the reaction by the other roaches makes this seem likely. It might be some kind of sex attractant, but the females would probably be more interested then.

Sex attractant may be... It dried up really fast after the male put it down.