10. Kabukichō

Tokyo, Japan

What to expect: Kabukichō caters almost exclusively to Japanese locals and their passion for odd sexual fantasy; it can be a difficult place for tourists. Clubs are often themed, and filled with sexy secretaries, nurses, maids, dominatrices, you name it -- it’s like Halloween year-round! There's naked karaoke, rentable sex dolls, and even “soap lands” where you'll get soapy clean before you get dirty. Not to mention hostess clubs, where you pay for companionship. How sweet. While paid sex is illegal in Japan, everything else is fair game -- just be sure to pay attention to the clock, as the sex clubs close at midnight.

What it’ll cost: Prices for host clubs run from about $30-$140 for two hours, depending on the quality of the joint. A pink salon will set you back about $20, while escort services -- where the ladies come to your room -- start around $250 an hour.

Be warned: Don’t just pop into places to check them out -- bouncers are known to hustle tourists with exorbitant, non-negotiable entrance fees.

Did you know: Kabukichō is home to a large region of ladyboys, the local term for transgender individuals who also work the district.