Calling something luscious means it's appealing and incredibly pleasing to the senses. That goes for good-looking people as well as a rich piece of chocolate cake.
An adjective meaning richly appealing or scrumptious, luscious is actually believed to be a shortened version of delicious. Synonyms include succulent, savory and enticing — all words that can also be used to either describe a perfectly cooked steak or your crush's unbelievable, irresistible lips.