While there is a risk involved, it's a very small risk compared to BBFS. Some are transmitted skin to skin, some require an open sore or cut, some just require sexual fluids.
Women are more susceptible to acquiring something than men but still the chances are slim.
While it's impossible to tell by just looking at a person, if you see something funky just walk away.
Originally Posted by pornodave69
Agreed, It also depends on how well that girl.in.question takes care of themselves; it's possible to be exposed to stuff and never be infected by it simply by having a superb immune system and strong peripheral immunity as well...
It comes down to the same factors that determine everything to do with health in general...stress, diet, genetics etc...
As a general note though, the pathology of the girl is very important -
STAFF EDIT - PD