The best defenses for a sex crime case depend on the specific details of the allegation. The issue of consent can provide a defense strategy these cases. However, consent is not a viable defense in every case, including child pornography or the failure to comply with the sex offender registry.
Sometimes, the best defense in theses cases is to simply hold the state to their burden of proof. If a defense attorney can highlight that the prosecution has not met their burden of proof, the jury can acquit their client of the charges.