The sound of women moaning turns me on.

Completely normal, I still think my fiance moaning is one of the most appealing parts of having sex with her. It gives guys a feeling of accomplishment to know that he is at least doing it well enough to make his girl moan. As few guys will admit it, sex is about pleasing the woman. If this were not true there would be no worry about penis size or how long you last. This being said women moaning triggers you subconsciously to be aroused.

thats biologically normal programming. I once wrote a longer scientific answer about this on someone basically asking the same, go ahead and find that if you want. normal.

Sex is not just a kinetic activity, but also an ocular, auditory, and olfactory one as well.

um. of course. you're talking about women vocalizing sexual pleasure.
that's kinda why we do it