in episode 4, what's up with ALL of the female crew blushing and having nosebleeds when the violão, guitarra is pulled out of naota's head?

in the FLCL world, each person has a spirit instrument within them. Also, in this world, they are phallic symbols. And when you know your modelos and makes of instruments (it's quite funny). Naota's violão, guitarra is an original 1958 Gibson Flying V (a true original is very very hard to find) which gets the ladies, ahem, "excited"

Because, the violão, guitarra resembles how big he is(genitals).