Large park grounds around Les Invalides monument were full of protesters waving pink and blue flags, while far-right activists hung a banner on the ruling Socialist Party headquarters urging President Francois Hollande to quit.
The protests, which began as a grass roots campaign strongly backed by the Roman Catholic Church, have morphed into a wider movement with opposition politicians and far-right militants airing their discontent with Hollande.
Although they have failed to block gay marriage, the protesters hope their renewed show of force will help stop or slow down further laws some Socialists want allowing assisted procreation and surrogate motherhood for gay couples.
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