Its what you call "seagull posting". swoop in, crap on everything, make alot of noise, and swoop off.
I don't buy the whole HD/LD thing, either, btw.
kind of off the subject, but I think this is better described not in terms of "high" and "low", but rather "stable" or "constant" vs. "variable". HDs are not necessarily "wicked horney", wanting it all day, every day. but whatever level they do require, doesn't change much based on whats going on around them. And what we often call "LD" is not always just plain low, but rather, it seems to come and go, and be very much influenced by external circumstances.