An unenforceable contract or transaction is one that is valid, but which the court will not enforce. Unenforceable is usually used in contradistinction to void (or void ab initio) and voidable. If the parties perform the agreement, it will be valid, but the court will not compel them if they do not.An example of a transaction which is an unenforceable contract is a contract for prostitution under English law. Prostitution is not actually a crime under English law, although both soliciting a prostitute and living off the earnings of a prostitute are criminal offences but so long as the contract is fully performed, it remains valid. However, if either refuses to complete the bargain (either the prostitute after being paid or the payer after receiving the services), the court will not assist the disappointed party.[citation needed]Sometimes, contracts may only be enforceable one-way, and unenforceable the other way. Again, there is an example from the field of prostitution: In Germany, where prostitution is also legal, a law exists that—once a contract has been entered into—makes a prostitute's demands for payment legally enforceable (even via collection agencies and courts if necessary), while leaving the John's demands for fulfilment of the contract and rendition of sexual services unenforceable. German lawmakers made only the claims of prostitutes enforceable because they intended for the German prostitution law to protect only the prostitutes, without helping or furthering the interests of buyers of sexual services.To impugn a contract means attacking the integrity of the contract. A way this can be done is by deeming the contract unenforceable. A contract can be said unenforceable when it goes against the statutes of fraud or the Statement of Goods Act.