I'm not sure how UK law works, you might be right. It is certainly possible to convict a woman of raping a man in Sweden however.
Our modern societies do not require there to be a contract in order for fatherhood to be established with all of the rights and obligations which that entails. I'm not sure of exactly how much of a legalized society you envision living in, but I'm fairly sure that even in the UK you become a father without a contract?
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