The simple answer here could be that depression is causing both a lowered response to music, and a diminished sex drive. However, arousal levels from music and sex almost always seem to go hand in hand, I can't say I've noticed a strong correlation between them and general depressive symptoms.
I've also noticed a curious effect from a few substances that increase both music appreciation and libido simultaneously. Piracetam, for instance, has caused a noticeable increase in libido and emotional response to music, the same goes for Phenibut, and occasionally coffee/marijuana/alcohol (though not nearly as consistently).
I can't really make sense of it. I don't see why these two conditions should go together. I don't want this all to be linked to depression because it doesn't actually help me understand it any further. I suppose what I'm really trying to pinpoint is what neurotransmitters/hormones could be responsible for arousal from both sex and music.
Edited by Wingless, 22 August 2015 - 03:01 PM.