Interesting stuff.
EDIT:
I still have some doubts/questions though. I remember reading about a study about administration of 8-OH-DPAT, a selective 5HT1A agonist (actually also 5HT7 agonist), in mice and it raised oxytocin and prolactin concentrations, aswell as some sort of behaviour that i don't remember the name, something like them mice spending more time together. And then another study (
here) about administration of a 5HT1A antagonist blocking the 8-OH-DPAT effects.
That was what led me to believe that 5HT1A activation was what made MDMA and the likes different from regular stimulants (coke, amph), not the serotonin release. Because you see, amphetamine and meth are also serotonin releasers (i believe also by blocking/reversing the vesicular monoamine transporter, i don't know) and coke also increases serotonin levels via reuptake inhibition, and none of them are empathogens.
MDMA may have low affinity to 5HT1A but may be it has a big efficacy, making it more efficient to release oxytocin?
But if empathogenia comes from 5HT1A agonism and not MDMA's effects on SERT/VMAT whatever, then how SSRIs block its effects?
I'm just a layman, looking for some answers... May be i should start a thread at NPD though...