Having sex without a condom does not guarantee 100% transmission of sexually transmitted diseases, including herpes. However, the risk of transmission is significantly higher when engaging in unprotected sexual activity. Herpes can be spread through skin-to-skin contact with an infected area during oral, genital, or anal sex. It's essential to use condoms and practice safe sex to reduce the risk of transmitting STDs like herpes. If you have concerns about your sexual health or possible exposure to herpes, consider getting tested and speaking with a healthcare provider for guidance on prevention and treatment options.