There was no way that Stiles was going to leap to the right conclusion based on what Lydia was saying. He followed her logic easily enough. Everything she said made sense and he felt pretty much the same way about his own useful contributions.
"So, what, you want to hurry up and get pregnant first?" he asked. "I mean, I guess that kind of makes sense, but how are you going to figure out who the best person is to hook up with? Are you going to post a personal ad like Malia did?" No, he wasn't bitter about that at all. How on Earth did he end up with her as a girlfriend if she was looking for pretty much the exact opposite of what he was?