As I said, it was something personal. I guess all this comes from Gail automatically dismissing anything that's not "girly". She reads erotic novels and chooses romantic movies over other options, she rolls her eyes over anything remotely nerdy, like Theo trying to help her with something computer related and considers gaming a waste of time, quickly trying to draw Nathan's attention towards something that she finds important instead.
Now, I totally understand all of that fits within her current personality, and I'm not thinking about turning her into a Twitch streamer or anything like that, but if you're trying to flesh her out, maybe she could have a conversation with Theo about reading habits and he could start talking about fantasy and sci-fi. Obviously, at first, she rolls her eyes again, thinking it's all the usual nerdy stuff Theo's always talking about, but then she could try reading a little for some reason and find she actually enjoys it. That could create a back and forth between both of them, where she teaches him how to be more assertive, confident and charming around women and he introduces her to a new and less one-dimensional area of literature and entertainment in general. I don't know if I'm asking too much from a porn VN though.