Perfectly legal:
3. Evidence of Animal's Sex (WAC 232-12-267):
It is illegal to possess or transport big game animals unless evidence
of the animal's sex is left naturally attached to the carcass until the
carcass is processed or stored for consumption. Evidence of sex means:
••Male - head with antlers or horns attached or penis or testes any of
which must be naturally attached to at least one quarter of the carcass
or to the largest portion of meat.
••Female - the head or udder must be naturally attached to at least one
quarter of the carcass or to the largest portion of meat.
Big game taken in antler or horn restriction areas: The head or
skull plate, with both horns or both antlers naturally attached,