boutique
obscure and unknown (idiom); an outsider without any reputation / a nobody / an unknown quantity
vice / degenerate pleasures
to allow oneself few comforts or pleasures (idiom)
lit. to buy smiles to seek happiness / abandon oneself to the pleasures of the flesh (idiom)
to spend one's time in drinking and pleasure (idiom); to indulge in sensual pleasures / life of debauchery
unknown
under investigation / currently unknown
to explore a mystery / to probe the unknown