Exchanging body fluids with anyone obviously increases the chances of picking up any of the usual coughs/colds/sore throats etc that are going around. It's not just the STIs to think about, its the other normal things we can all pick up anyway.
WGs interact with a lot of other people who are also doing it with other WGs, so it's easy to pick things up. Its not necessarily a bad thing, that's how our immune system works, the more we are exposed to, the more immune we get...well in theory.
If you can't get rid of it yourself go see the doc, no need to say you've been munching on whores fanny in the first instance.