According to the content policy, non-graphic sex is allowed, if it's behind an NSFW-filter - however, I'm afraid that your comic would most likely break the rules, as you depict full frontal nudity, clearly detailed genitals, sexual acts and rape^.
So even with an NSFW-filter, your comic is likely too graphic for Tapastic. Even if you say you have fantasy-adventure elements, it's clear that the pornography is a central element as well, and according to the content-boundaries policy, that is not allowed. Relevant passage bolded:
Adult Material: Tapastic ALLOWS mature content featuring nudity, non-graphic sex, extreme violence, and strong language as long as it is behind our NSFW filter.
Tapastic DOES NOT ALLOW pornography or hateful content that targets a specific person or group of any kind.
^.) The rape I'm referring to is the first sexual scene, starting from page 7 onwards, as the heroine does not seem to be given the chance to give informed consent. I stopped reading after page 12.