The Length Of Time Must I Wait To Check For The STD? Exactly How Immediately After Unsafe Sex Must I Get Tested? With over 80 million brand new instances of sexually diseases that are transmitted each year in america, one cannot but be too careful whenever intimately active. The American Sexual wellness Association describes that certain in two intimately active United states will contract an STD because of the full time they reach the chronilogical age of 25 years. While instances are from the increase, exponentially, studies reveal that just 12% of young intimately active United states had been tested year that is last.