It all starts when Riah and Brian get close during the first few get-togethers with all of the couples in Episode 1. Lisa has a hard time dealing with what the experiment means in terms of potentially losing her partner to someone else. And she lashes out at both Riah and Brian. And during the reunion, Lisa and Riah have words with each other.

Lisa says that she felt like Riah was "actively after Brian" at the start of the season. Riah says that she believes Lisa used her job at Hooters and Lisa's past experience working at the same place as a way to be "disrespectful, rude, [and] tasteless" to her. And by all accounts, it doesn't look like the women are in contact outside of the show.

"It just seems like you were trying to put down another woman because you were upset," Riah tells Lisa during the reunion. "I did not appreciate that at all."

To this, Lisa replies, "I don't care." Yeah, it's safe to say there's no love lost between these two.