Bangkok is by far one of the most exciting places. From Buddhist monuments peppered all over the city to its extravagant malls and endless nightlife, travellers fall in love with Thailand and cannot wait for the day to go back again.
With respect to the nightlife in Bangkok, it is boisterous. There are clubs all over the city where men and women dance the whole night. To bars where men look for women for romance that will last their whole trip, the whole night, a few hours, etc. Women in these bars generally speak a modicum amount of English because they interact with business travelers for a living.
But it is the underground nightlife that many men do no realize. There are sections of Bangkok that are open all night long where men pick up women for a short time for sex. But these sections are very dangerous for travelers because they are not regulated. Many may have AIDS. With established institutions, girls are checked at those massage parlors but not in these underground areas. It is also possible to have sex with underage women which is an illegal act for an American to do. It is not a recommended place to go because of the possible illegal acts and the possibility that you get AIDS.
Although it may seem exciting to be doing something underground but in a country where it is already wildly liberal, doing anything underground is really pushing it. There are also areas of the city where drugs are heavily prevalent.