Unfortunately, no. The expectation is that you are there to entertain - not to have sex with the audience. Some "entertainers" do choose to do that; hopefully they are practicing safe sex with condoms and screening their partners carefully, although they are unlikely to do so. Remember - you are having sex with whoever that person had sex with before!
Adult entertainers (pornographers) regularly take blood tests to detect STDs. Many stars don't use condoms. The other way to stop the spread of disease is early detection via blood tests.
An STD test is required to work in certain fields of the adult entertainment industry. A test may not be needed for exotic dancing, nude photography, or anything not directly related to intercourse. Legitimate adult video companies will require an STD test before making pornographic videos.
The rules for this can vary from state to state and from company to company. However, testing for sexually transmitted diseases is a very common pratice in the adult entertainment industry. All of the reputable companies require it.