Couples sit together on a bench following a "kiss-a-thon" to mark International Day Against Homophobia, Transphobia and Biphobia, in the Alameda park in central Mexico City.

A woman reacts as her friend takes up the offer of a free kiss, following a "kiss-a-thon" to mark International Day Against Homophobia, Transphobia and Biphobia, in the Alameda par...

Couples kiss during a "kiss-a-thon" to mark International Day Against Homophobia, Transphobia and Biphobia, in the Alameda park in central Mexico City. A few dozen people participa...