Lust, Love & Long-Term Bonding by Dr Jack

Behaviours associated with lust, love and long-term bonding developed through evolution of separate but overlapping brain systems. Lust encourages coitus on a relatively indiscriminate basis: ensuring that genes are passed on to the next generation. Love involves a sexual preference for an individual considered in some way superior to the competition. And long-term bonding encourages fulfilment of parenting duties.