The whole thing about ending deeper at the end of the sentence seems to me to be an American thing; here in Ireland I have heard plenty of straight men use higher notes for emphasis and end their sentences on higher notes (especially down the south of the country). And in England, too - male British RP (received pronunciation, or 'posh' speak if you will) is perhaps a little less inflected than female RP, but is not monotonous, and is articulate. I'm no expert on accents, of course; these are merely my own observations. I end up sounding distinctly American when trying to pull off the monotonous grunting act. My own accent is a dubious combination of the west of Ireland and RP. I'm very fond of words, and often speak for the pleasure of speaking, tasting each syllable in my mouth. And it does sound a bit gay, but then again, I am gay...
Do other Europeans here have any thoughts? As previously stated, I am no linguistic expert and could easily be mistaken.