Oh, and just want to say, this is Via Nursing instructors and 2 doctors, so they could be wrong, I just want you to take precautions, as this is apparently fairly new research. Sucks that Lyme is such an unknown disease, becuase it's rampant.It's not considered a STD, but when it is ACTIVE in the body, it can be sexually transmitted, and even transmitted through blood, but it has to be active. My husband learned about it last week during his Nursing finals, and then researched it, becuase I had Lyme, and do deal with the after effects of it, and last thing we want is for him to contract it. So no it's not listed as an STD, but if it is active in the body, it can be sexually transmitted.