Critics argue that Bem's research suffers from cultural bias as it only measured US participants.
It was based on the idea of what were typical and acceptable traits within the 70s and was devised with 100 US judges using ideas of 'maleness' and 'femaleness'.
However, these notions of maleness and femaleness may not be accepted and shared across cultures and therefore it may not be generalisable.
It also lacks temporal validity as what was deemed typical and acceptable in the 70s may not be considered that now.