system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why, when I'm horny, do I have questionable thoughts and make questionable decisions as to the things I would do and who I would do them with? When I'm of normal (not as horny) mindset I many times would write those thoughts or decisions off completely.
gpt
Priorities.

When your horny the only thing you really want at that time is sex, everything else is deemed much less important. So you tend to make questionable choices and have questionable thoughts as our brains try to satisfy this desire. 

Once satisfied it isn't really important to us anymore so our priorities change and our brains turn to the next important thing beside food and sex, sleep and thus our brain stops having all these dirty thoughts since it has no desire for sex anymore.

As smart as brains are, there shitty at multitasking, so we tend to only focus on what is most important to us at that time. Also even tho humans seem to be complex creatures, we were really only built to have three main functions; eating, fucking and sleeping.