4. Oral sex:
Oral sex can transmit most STDs, including herpes, gonorrhea, chlamydia and syphilis. Condoms would reduce this transmission rate significantly- that’s WHY flavored condoms exist, to be used with oral sex. If there are open sores in the mouth, this would make it possible to also transmit HIV and hepatitis B and C. Trichomonas is not spread by oral sex.