sit was actuallllly reallllly easy to telll, i had two definete males and rippped them out, they had a ishhhhhhh load of ballls on them.. I have 3 pos females that i believe i see, because i see the white hairs on them, the others im alittle worrried because i cant tell the sex yet, this strain sucks, and i wont b able to take care of these in week, ill be away, so i hope if any others turn male ill be able to rip them out!, will take up to date pics of the plants later, there in there dark period right nows