It is possible to be drunk without having ingested alcohol. Auto-intoxication is the state of being drunk without having ingested alcohol.
Intoxication in sexual matters makes it harder, though not impossible, to do what is right in sexual matters. If you find yourself intoxicated, whether actually intoxicated or auto-intoxicated, you should immediately do what is necessary to end your state of intoxication. Also, you should live by the rule of never doing anything that causes any kind of intoxication.