A sexually transmitted disease -LRB- STD -RRB- , also known as sexually transmitted infection -LRB- STI -RRB- or venereal disease -LRB- VD -RRB- , is an illness that has a significant probability of transmission between humans or animals by means of sexual contact , including vaginal intercourse , oral sex , and anal sex .

A sexually transmitted disease is a disease which generally spreads by sexual intercourse , including oral sex or anal sex .
