Daniel's headline reads that he's using science to "get the girl." He explains that there was actually a study in which researchers put two people in a room to ask each other increasingly intimate questions and then stare in each other's eyes. The test subjects eventually got married. He looks up the study and finds the 36 questions, thinking he's not above science.
Daniel misrepresents the study a bit; there were many test subjects, not just two, and only one pair got married. His misrepresentation, however, mirrors how Natasha talks about her relationship with Rob, which shows that she and Daniel have a lot in common.