Back on topic....Here is the information regarding getting an STD from oral sex. I am including the web page and an excerpt from that page. First the excerpt:
Although oral sex is a relatively low-risk activity, particularly when compared to vaginal or anal sex, it is possible to transmit HIV through oral sex. Using latex or polyurethane condoms, female condoms, or dental dams is an effective way to reduce your chances of contracting the virus when engaging in oral sex. If you don't choose to use protection for oral sex, you should know that the risk of HIV transmission increases if the person performing the act has cuts or sores in his/her mouth, if ejaculation takes place in the mouth, and if the individual receiving oral sex has any other sexually transmitted diseases.
The risk is primarily for the person performing the oral sex. Unless a partner has significant amounts of blood in his/her mouth, such as from dental surgery, oral sex is unlikely to expose the receptive partner to HIV.
and the link:
http://std.about.com/od/riskfactorsf...sexsafesex.htm
I hope that this gives you some insight into why so many feel that oral sex is relatively safe.