Nature enhances love by reducing stress and increasing oxytocin, the hormone linked to bonding and connection. Shared ...

The purity of love is explained by Sorokin's old-fashioned definition of altruism. "Love known no bargain ... no reward. love is always for love's sake." Sorokin attacks the blind "romantic" kind ...

This would potentially suggest that altruism is an evolved trait to indicate good partner/parent quality, which would align regardless of sexual orientation as same-sex couples can still have ...