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There is no such thing as a "legal age for sex." The age of consent in Ohio is 16. That means that a child under 16 cannot legally consent to sex. If an adult has sex with a person under 16, it is...
Depends on where you are. In the UK it is 16.
16 is the legal age. No one can give a minor permission to have sex, that would be breaking the law.
This depends on the country you live in. But, for the most part, the minimum age permitted for consensual sex is 18.