for some teens it may be love, but its only a rare few.
as for the others its lust, obsession, or something along the lines of that.
so its almost sterotypical to say that theres no such thing as teen love=P
traditionally guys would ask the girls out, but at a modern day and age i guess girls could ask guys out too. depends on the people though, i myself find it hard to ask someone out and if a girl asked me out i wouldn be offended or such.