Archive Rules: The Devil Is In The Details
Various archives have various rules. Sometimes you have to read them carefully.
"Forced Marriages - Consented, arranged marriages, between adults, where both parties agree to the situation they are in, and are happy about what is going on, is VERY different to being forced to marry someone against their will. So forced marriages are not permitted.“
So, marriage that is consensual and arranged is all right, but only if they are both happy about it. Works for me!
Another site had this disclaimer: "Wolf Moon is relatively broad minded with respect to content that is allowed on the site. Submissions that contain Sadomasochism, Scat, Watersports, Snuff, or Bloodplay (‘cept for VampSex) will not be accepted. Beastiality [sic] is acceptable, as long as the animal is sentient, or is a human in animal form. Chan is allowed for characters 14 or older. The point to consider here is this: Consent. This element is vital if your fic includes Beast or Chan.”
So, sex with animals is all right if the animal can not only talk, but agree to consent! Works for me!