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 ...

It is a comprehensive investigation of altruism, aka benevolence, compassion, generosity, and kindness. It's no surprise that, when we're on the receiving end of love, we reap a benefit.

Altruism probably involves brain regions connected ... whose second line in the movie — “I have just met you, and I love you” — Marsh said reminds her of some of the altruists she studies.