People constantly conflict logic and emotions. Logic tells me not to fall for a girl since I'm only 21 years old but my emotions cause me to spend a lot of time with her.
Logic may tell a girl not to easily have sex with a guy and to make him work for it or whatever, but her emotions can cause her to have sex with you and ultimately have a sexual relationship with you.
There's no need to insert logic into a conversation. Meaning; there is no need to mention you have a cool job, have a nice watch, or drive a nice car. You are better off appearing modest about these things so it doesn't seem like you are trying to use logic to get the girl. (She has to like me! I have a cooler job and nicer car then her last loser boyfriend!)