J/P - this dichotomy is seen in behavior - common and nonverbal. P types are more chaotic, impulsive, lesser stable. P easily change decisions, moods, plans, act not by common rules, ...
To understand the nonverbal difference may be looked my bloggers types examples.
Valued functions. Fi care more about emotional comfort and politeness, while Fe behave more funny or rude. Ni have more interest in esoteric and forecasting, while Ne in understanding of current state of concrete people. Te - EII like when someone shows factors of something, facts ; helps how to do, with information ; has good skills to do something. Ti - like when one system is shown, not just a list of factors ; helps with understanding how things are linked and of your role in something bigger ; like good and clear formal social status. Si - seek for physical comfort and pleasant sensations, help with health. Se - like expensive things, money, pricy gifts, the will to do something, physical force.
In romance EII like tender caring, friendly behavior and practical help. IEI - to be conquered: she may tease you by passive ways (like the cloth more open than could), but prefer you made the main actions in closing. In the beginning, even if IEI woman likes you (this may be seen directly in her emotions and indirect circumstances), she may play in rejection, to be not friendly to test how much you want her, how much you may sacrifice for her ; if you'll take such play seriously and leave her - she'll feel insulted and will regret about her play, may to hint you that she likes you, but to make "the needed step" herself she thinks as below of her honor.
Intertype relations (IR). For example, EII find as more psychically comfortable delta T types, than beta T types. My types examples may help.
Dichotomy tests. EII are typed (when correctly) as INFJ by MBTI and by other dichotomy tests.
I spread the truth and reason.