I know a person who tested ESFP twice but who acts like an INTP when he is alone or with one other person. He is like an ESFP in that he thrives on contact with others, has a large network of friends/rotating girlfriends and is a self-described 'hedonist' who gravitates toward the sensual. However, he spends many hours alone reading books and watching lecture videos about philosophy. He plans to pursue philosophy as a major and is quietly and intensely engaged when listening to someone discuss related topics. He picks apart and critiques arguments carefully, even journaling about his thoughts on what he is learning. It is clear that he spends more time alone, reflecting on broader existential issues, than partying. He even seems to need this ability to retreat. Also, I suspect some of the sensualism is attached to Si, not Se, as he says that music, scents, etc. have meaning to him because they evoke specific memories and experiences. I don't know what to make of it, honestly.