At this rate it might be very rational to look at ways to modify our cognitive architecture and limbic system to experience long term and sustained attraction and love... rather than hack it via external stimuli.

MDMA is promising when it comes to revive intimacy between long term couples. But its neurotoxic profile makes this non-workable for most people. Long term sustainable mood enrichers and love enhancers should be developed... this will be much more life enriching than just rationally learning what relationship style best suits you.