Most Helpful Guy
the human is programmed to have it fade over the period of 4 years. this is biologically programmed and inherited from our ancestors. basically so your spawn is out of the worst before you move on. sounds harsh but is the blunt truth. however, there is no reason why this process could not be reset. hence why a relationship is never set in stone an always needs to worked on. basically, keep falling in love and all is good0THIS IS NOT RELEVANT ANYMORE
Most Helpful Girl
The excitement fueling lust fades.
If you're with someone with whom your 'chemistry' runs deeper than being purely physical, though, it doesn't fade. I've been with my boyfriend for over three years and the sexual+mental chemistry between us is stronger than ever.3THIS IS NOT RELEVANT ANYMORE