Can you say a girl whos just a friend and nothing else has a low IL.
No, not necessarily. I don't know how many times I've been friends with a woman whom secretly or evidently really liked me; meeting a woman when she has a boyfriend is a good example. It all depends on
if she wants nothing else, which can be deceiving, and other times clear cut. Bear in mind that when you meet a woman, you're not meeting her you're meeting everything else in her life; dating does not happen in a vacuum free of outside influences.
A girl who you mess around with or sex with has a higher IL and a girlfriend has a really high IL.
Human relations are all about roles. There is the wallet role, the dildo role, the court jester role, etc. Whenever you meet a woman she knows what roles are up for vacancy in her life, and she also knows what role you want to fill. If the role you want is occupied or if she doesn't want to give you that role, she may offer you another role. This is human nature. So the woman who gives you the dildo role may never allow you to have another role, and the same fundamental thing can be said of girlfriends. In my past there were times I was even denied
any role because the woman knew if she gave me a role, I'd want more, like times they'd deny me a wallet role because they knew I also wanted a dildo role.
In other words, "interest" is not singular.