Eveything is just sex nowadays. I am getting sick of people vulgarizing everything. It's not about the "sex" because it is a beautiful act humans do and so but let's change our perspective for a bit. His voice is pure sex anyways.
while the lyrics definitely seem to be referring to a kinky context at first, I think there's a very strong case to be made that the whole propeller metaphor refers to a more abstract concept, such as inspiration or in any case, a feeling of being stuck and not knowing how to get unstuck(you could of course still link this to some sort of sexual context...but that seems way too simplistic IMO)...the fact that it's 'Coax me out my low' and not 'Coax me out, my love' supports this