repeatable_quests.gd, line 466
description = "A member of the $rare race desires a worthy mate for reproductive purposes. $He must be at least average in appearance and open to $his mate's commands. ",
In game it looks like this
Viewing post in Aric's Expansion Rebred
Vanilla Strive has no less than 3 different dynamic text systems, which have different formats and functionalities. The slave guild has one because the other systems are designed to work for people that exist, but the request for a person is not a person. The slave guild's text system is very bare bones and does not support most gendered pronouns like the single person system, so the fix is most likely adding text replacement for those.