Are there hustlers and male prostitutes who will ask for money?
Generally speaking, NO. In North America and Europe it would be rare since most patrons can have sex with each other for free there is no need for prostitution. In some countries however [such as Brazil] many bathhouses [but not all] may be fronts for male prostitution and money will be expected for sex. In many Asian countries, bathhouses are basically “massage parlors” and money is required for a “massage.