system
Given the following post, respond as if you're commenting on Reddit:
human
What is the physiological reason that increased arousal leads to increased quantity of ejaculate [Possibly NSFW]
gpt
> Presumably the body doesn't produce extra quantity when extremely aroused

Emotions aren't brain weather, they're physiological states.  You salivate more when you smell amazing food (or you're particularly hungry); you produce more ejaculate when you're more aroused (or aroused for longer).  In a sense, from the male perspective, arousal is physiological preparation for insemination.