Oh sorry. My mistake. Now I see what you mean. If I google it, they say everywhere that premature ejuculation is a sign of low serotonin. But I can't find any evidence besides that selective serotonin reuptake inhibitors treat premature ejucalation, that is why I wrote it that way. But maybe those website are taking the wrong conclussions, and it just not a symptom of low serotonin.