STDs can be transmitted through anal, vaginal, and oral sex. Some of the most common STDs are HIV, Herpes, HPV, gonorrhea, and chlamydia.

If a couple has both anal and vaginal sex, they have to be careful. They should never go from anal to vaginal sex without changing condoms first. Going directly from anal to vaginal without a condom change can result in some nasty infections.

what Sexually transmitted diseases are possible to contract if my boyfriend has oral sex on another woman's vagina and then kisses me deeply?
He feels that there are NONE capable, none possible of being contracted from her vaginal juices to his mouth, to my mouth.