This website has made me feel a lot better about things I have worried about, with regards to sexual activity. However, on almost every other website, while in agreement that unprotected oral sex is low risk for HIV, they all say that unprotected oral sex is about the same risk for other STDs (including chlamydia) as is unprotected anal or vaginal sex. Why is this? I trust the advice I hear on this site, but am curious as to where the discrepancies in advice come from. Thanks