Yeah and even if they try to break the stereotypes by having the seme be the timid femboy and the uke be the masculine guy, I can still tell. You could tell by face structure, their personality and obviously body.
Stereotypical:
Big eyes with eyelashes, pink lips,
Skinny & and the goddamn bowl cut = bottom
Small eyes sometimes with eyelashes, sk......
stop thats so cute
no way a literal triangle where no one can be happy
STOP STOP STOP STOP
no fucking way