The way to learn is:
this paper http://www.birdspiders.com/faq_sex.php
plus
experience (seeing as many ventrals of as many Ts of as many species as possible).
Trimac, do you mean to say that you would look for the spermathecae on the interior of a molt to sex the T? Because I believe what you're talking about cannot be seen externally. The "flap" is the uterus externus, with the "horns" being the spermathecae... and these are internal structures. They are shed with the exuvia so that they can only be seen on the interior a female's molt.
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