no i dont think it was seratonin. It was some other thing that I didnt quite catch cause it was oddly stated. It makes men want to "protect". Had the experiment done on a gerbil. At first the gerbil would just act buck wild. Running around. Gave him a dose of this stuff and he'd only fight if the "wife" and kids were threatened. This drug made it docile- reserving its aggression only when necessary. And it made him settle down- picking one gerbilette to settle down with as oppossed to many. This is suppossed to correspond to human males somekindahow.
But with females- it's "touching" that does it
How do you get rid of oxytocin? 
why would u wanna get rid of it? According to the show, no touching--> reduction levels of oxytocin