An STD test is the only way to know for sure that you have no STD. In a standard STI test is tested for Chlamydia, Gonorrhea, Herpes and Syfilles. In the STD Tests package is tested on all these STDs. For women, there is an additional test: Bacterial vaginosis.
Because you have a new relationship. And you want sex without a condom
Because you have had unsafe sex
Because the condom broke
As a partner or ex-partner, you have been warned
Physical complaints. Such as warts, sores, (more or different) discharge, pain when urinating
You're pregnant. And do not transfer to your child any STI
Security. Even if you have had unsafe sex in the past