Let's be clear: everyone
has candida yeast on their mucosa (any location you want to name) and in their gut. It's part of what is termed "natural flora" (rather a nice medical phrase for once, isn't it?). The problem arises when the candida overgrows the other natural flora and kind of takes over, producing thrush (if, in the US anyway, the overgrowth is in the mouth) or vaginal candidiasis or the common "yeast infection" if it's vaginal.
It has dog-all to do with secks-you-all activity, with one notable exception, which is that it is considered an opportunistic infection in immunocompromised patients and there is one STI that does cause immunosuppression: HIV. And in immunosuppressed patients it can be a much more serious disease (it can be disseminated and even seed itself into the bloodstream (candidemia), which usually doesn't happen in otherwise well patients. But anyone
can get candidiasis. It's more likely to happen after courses of antibiotics, as the previous poster who worked in a pharmacy mentioned, which is because the antibiotics kill off the bacteria that are also part of the natural flora and give the candida (a yeast or fungus which is not affected by the antibiotics) a chance to take over. It's more common in diabetics because the yeast also feeds on sugars, which are more prevalent in the blood in diabetics. But there's absolutely no reason to make assumptions about herpes, which IS a transmitted disease, one way or another.
Xallanthia, I have to admit that I'd ask to see too.