Last November the country was left shocked when a 30-year-old man who had sex with an 11 year old girl was acquitted of rape, after the court found that she had not been the subject of "constraint, threat, violence, or surprise".
It would be the first such law in France, which now does not have a rule saying a child under a certain age is considered incapable of consenting to sex. Unlike in many neighboring countries, French laws treat sex with minors as rape only in cases when prosecution manages to prove that the intercourse was forced - that coercion, threat, violence or surprise was used.
The change comes amid uproar over two recent cases of men accused of having sex with 11-year-old girls. Instead, the men were charged with sexual abuse of a minor, a lesser charge.
France's Minister for Gender Equality Marlene Schiappa said the government had chose to keep the age of consent at 15 following a citizens' consultation and the findings of an expert report.
She said: "We want to fix an age in the law below which it's always forbidden to have sex with children, with young girls, below which it's always considered as a rape".
The new law would create a threshold, said Schiappa, according to which any sexual activity with a child under the age of 15 will be criminalized and it would be considered the child was coerced.
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They asked for the government to bring France into line with most other European countries by announcing a minimum age of consent, which varies but is usually between 13 and 15.
The change is part of a wider law "against sexist and sexual violence" that will be presented to the council of ministers on March 21.
Minister of Solidarity and Health Agnes Buzyn said setting a legal age of sexual consent would allow a "collective awareness" and that everyone would see what was "legal and illegal", Le Figaro newspaper reported.
Ms Schiappa told AFP news agency that her ministry was "very glad" that the higher age was chosen.
Once implemented it will criminalize any sexual conduct with any minor under that age.