Whats an STD?
STD is short for sexual transmitted disease. They are diseases you can catch when you have unprotected sex. An STD is transmitted through sperm, blood, pre-cum (when men are sexually aroused) and vaginal fluid (when women are sexually aroused). Some STDs are transmitted through skin contact.
How do you catch an STD?
How to avoid catching an STD?
If you've had unprotected sex
Oral sex and HIV / STD