I know exactly what you mean. It’s starts of as a slow tingling, butterfly feeling in your stomach then spreads all over as real sensuality.it seems like it starts of as pure libido (not just sexual) and that unfocused libido and energy is exerted in all directions: as an upbeat vibe, as charisma, as just energy. p78 is really bubbling pot of energy which slowly caresses you making you become more and more aware of the sensual feeling it has in your body - it’s like sensual arousal rather than sexual arousal.