I don't have experience, or inside knowledge, but I would suggest avoiding anything about family/incest in your title or in descriptions. You might also wish to avoid pictures that look to similar (family resemblance) on Patreon. Other issues have included how young some characters may look, School settings that could cause questions about character's ages, and images that a reviewer might consider being to revealing outside the paywall (and sometimes behind it.
Honestly the best thing to do is hope for a reviewer that isn't extreme and be careful about putting to much information/detail on you page.
You may also want to look through the Patreon thread on this site to see if there is good information there.
Hope that helps.