after cheonging for so many years
i can understand no chicken farms can offer 100% good service gals
it also depends on your luck
and tried to use your instinct and experience in choosing
always remember...doesnt mean when you choose her she will choose you
if you dont mind fking a dead fish then its ok
if you want sex related with good feelings
then let her choose you

i tried that for years and it works
at least 80%