Actually depends on which STD you talking about.

For me, there are only 2 STDs which are of concern.

The first one is HPV because it causes bumps on the skin that only grows over time and they do not disappear which is a turn off for anyone. Even if your sausage had protection, her juices might still come into contact with your skin and give you that nasty warts.

The second one is HIV. Eventhough modern meds can allow you to live a healthy life with near normal life expectancy and makes transmission between partners difficult, there is still the stigma to it. Certain occupations require you to be certified HIV free.

If for other STDs like syphilis, gonorrhea and herpes virus other stuffs are fine because eventhough they cause some blisters they will eventually heal. Even now getting syphilis is very rare already, because of the antibiotics we take for sore throats could kill it easily.

If you have HPV or HIV then have some courtesy to inform the partner. Nobody would mention these things in bio but they may tell u in person before the deed.

Why do u ask? You had a surprise or unpleasant experience? 😄