@Ry Zen to varying degrees depending on the species, male tarantulas will have a small structure above the ventral opening that looks like a dot. Some species it's obvious, others can be harder to determine due to lighting and angle of observation. The sexing catagories on this site go by spermathecae sexing (using a molt to look for the female sexual organs) or epiandrous fusillae sexing (looking at the underside to try to find the spotting I am refering to).
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