A woman is offering to breastfeed babies of male gay parents for 100 euros (£86) a day.
The 29-year-old describes herself as a trained nurse in an advert posted on a French website.
The post, which the ‘e-loue’ website said is genuine and legal, reads: “I am a young mother in perfect health, a trained nurse of 29, and I am renting my breasts to milk-feed infants.”
The woman promises up to 10 breastfeeds a day, and adds that she is mobile and based near Paris.
In response to queries via the website, she said many people had replied to the proposal.
“I’ve received more than a dozen requests, but only half of them were serious. The rest were from perverts,” the poster of the offer, run under a pseudonym like all adverts, said in an exchange with Reuters news agency.
Alexandre Woog, chief executive of the website, said its staff had contacted the person and had no doubt about her identity and the seriousness of the proposal, nor the legality of the service proposed.
“Our legal advisers are sure of this. It’s illegal in France to sell maternal milk but this is a person proposing a service, not selling the milk in flasks,” said Mr Woog.
The advert comes just weeks after a divisive and historic vote to legalise same-sex marriages in the country.
The change in the law to permit gay weddings came into force in May and made France the 14th country to allow gay weddings.
But in a nation both predominantly Roman Catholic and fiercely attached to the separation of church and state, there has been major opposition to the new law amid nationwide protests.
French law also permits the adoption of children by same-sex couples. It does not allow surrogacy or assisted reproduction for gay and lesbian couples.
Mr. Woog said his website, created in 2009 as a platform where users can offer or hire anything legal online, checks all posts that raise eyebrows.
The breastfeeding offer is the second eye-catching advert to appear on the website, he said.
Another user previously offered to rent out two goats as lawnmowers.