I'm going to lead on multiple girls at once
Why do you want to lead them on?
I want to see how it feels to juggle relationships.
It is understandable to want to meet a lot of girls but you shouldn't lead them on. It will hurt their feelings and then you will have no one.
What they don't know won't hurt them huh?
They'll find out one day or another of what you're doing. You can't make any progress when you are in two relationships at the same time. Pick who you are most infatuated with and pursue her individually.