The most recent build removed the breeding sow class. Interbreeding is now enabled through the loyalty system.
Viewing post in what Race's cant have children together
I didn't mind that so much, since it mostly just served to underscore how surface level the species are. You bang a slimegirl and a human with blue skin pops out, that kind of ruins the magic for me. I'm more annoyed by the removal of the option for your starting slave to be a sibling. That and everyone getting "aged up."