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"I Love Her But the Sex Has Died": The Brain Chemical That Can Kill Libido in Long-Term Relationships

Trying to sustain a long-term relationship that is also sexual presents humans with a chemical catch-22.

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Chemical compatibility is essential to all good relationships. Couples lucky enough to enjoy long-term partnerships may have similar sex drives (perhaps not too much sex, or even none at all?) and dopaminergic systems that don't flood their bodies with too much prolactin. Human behaviour seems to be under the control of two evolutionary programs: one that results in fertilisation, disillusionment and a series of partners, and the other that enables humans to develop the lasting relationships that lead to long, happy and healthy lives.

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