An older woman having sex with a younger man is less natural based on bringing children into the world, more so if she's over 50.

I think that article summed it up. Jealous older women and bitter men envious of the guy with a younger woman on his arms. It's completely natural for an older man to want a younger woman, however I would be a sceptical of the motives of say a 20 year old woman dating a 75 year old multimillionaire entrepreneur.