system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why is it difficult to achieve orgasm on SSRI medication?

As in the title, i know it has something to do with serotonin levels. What is the issue exactly?
gpt
There’s not a 100% definitely know cause, but the leading theory is that screwing around with the serotonin levels in the brain affects the hypothalamus.   The hypothalamus is kind of the control center for other hormones.  Mess with that and the other hormones necessary for arousal and orgasm are impaired.