Amount of Dopamine released in your brain will peak after about 2 years of being with a new partner, at which point it's replaced by oxytocin. It's evolutionary

Amount of Dopamine released in your brain will peak after about 2 years of being with a new partner, at which point it's replaced by oxytocin. It's evolutionary: you change from being the lusty lovers to the providers (kids, job, etc). This man is describing this process exactly.