Up to 100,000 people across France took part in the protests against same sex marriage
It adds: "Breaking into the crowd dressed as nuns, activists will copiously irrigate the integrist demonstrators with Jesus' semen eroded from balloons."
The same post states: "FEMEN promises not to forget this incident and to take revenge on the organisers in the best Christian tradition: An eye for an eye, a tooth for a tooth."
The protesters carried posters reading: "One father + one mother for all children", and chanted: "Shame on the president, who'll protect the infants?"
Some of the protesters were thrown to the ground in the clashes
Polls show around 60 per cent support for the gay marriage, but not for gay adoptions. Same sex marriage was one of Hollande's campaign promises and his government plans to legalise it by mid-2013.
A Parisian couple marching on Sunday with two of their four children, told Reuters they knew the law would eventually pass, "But we wanted to show our disapproval."
Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(02 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(03 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(04 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(05 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(06 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(07 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(08 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(09 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(10 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)
(11 of11)
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Members of feminist group FEMEN carry out a protest in support of Russian band Pussy Riot, outside the Russian consulate in Sao Paulo, Brazil, on August 15, 2012. A series of global demonstrations are being held around the world to free Pussy Riot. A Russian court is to decide on Wednesday whether the band members will be jailed for protesting against Russian president Vladimir Putin. (Photo credit: PA/CRIS FAGA/AE/AE)