Herpes
Herpes is probably the most common STD that can be contracted while kissing. Herpes is a viral infection that is easily transmitted through skin contacts and exposure of mucosal tissues to the infection. Women are more susceptible to the virus. Having any sores in the mouth or on the lips increases the chances of obtaining herpes. Despite being relatively easy to treat, oral herpes can result in irritating blisters or cold sores on the lips and in the mouth. As long as Herpes is a highly contagious infection, it is recommended to make quick visual inspection of your new partner’s lips before kissing. Most Herpes-caused cold sores and blisters are obvious and easy to spot. If you are not sure about them, do not hesitate to ask your partner.
Hepatitis B
Hepatitis B is another STD that can pass from one person to another through saliva and exposed open sores. Thus kissing and sex play are potentially among the ways of contracting Hepatitis B. However, as most people in developed countries are vaccinated against the virus, there are not many cases of it and many people do not consider the virus to be able to spread through kissing. If left untreated, Hepatitis B can cause serious damage to liver.
Syphilis
Although highly unlikely, the possibility of receiving this dangerous STD through kissing should not be discarded. It takes an infected partner, the presence of open sores in the mouth and bad odds, but it can happen.
HPV (warts)
Contracting HPV through kissing requires the same conditions as in case of syphilis and is unlikely, but potentially possible.