此城市医院是一个特殊的医院，自从1933为三藩市(美国高危地区之一)提供性感染疾病检测。以下是医院多年累积关于艾滋病危险程度
病例1：
无套口 交(男女)-接受方
你并没有任何应该担心的问题，因为你身体所接受到的只是唾液，除非给与方口腔内有血流出。唾液本身有强大的杀菌功能。
以下是医生对接受方口 交危险性的看法：
Receiving oral sex hardly counts as a terrifying experience! Nobody has been proved to ever catch HIV by receiving a BJ, and some experts believe it to be no risk at all. Everyone agrees that if there is a risk, it is in the range of 1 per 20,000 exposures. To put that in perspective, that means receiving a BJ by an infected partner every day
for 55 years before getting infected.
其实接受口 交并不能说为一个那么差的经历吧(医生显然是开玩笑)没有任何人被证明是由于接受口 交而感染艾滋病。而且有专家相信这是一个零高危的活动。假如同意这是一个有危险性的活动，那就是1在每2万个同类接触，更好去理解的话就是，从一个艾滋病感染者那里接受口 交，每天如此，那也是在55年后才被感染。
评价：由于给与方输出大量唾液，降低被感染几率。前提是只要在双方(私处或口腔)没有出血，破裂。被感染几率还是非常小的。
案例2：
无套口 交(男女)-给与方
虽然在理论上，危险还是存在的。但是与3位专家咨询后，1位说是可能性非常小。另外2位则是非常肯定给与方的传染率几乎为0。在他们十几年与HIV战斗的日子里，并无任何病人有此感染，也没有看到任何可靠资料承认口交给与方有任何危险。下面是医生与一个病人的谈话。
病人：
Dear Sirs,I cannot believe my own stupidity, I work in Nigeria and 10 weeks ago got very drunk and brought a girl I met in a club home. I gave her unprotected oral sex and then we had protected vaginal sex. I have been worried since I woke up and relalized what I had done. I went for a test today and will get the results on Friday. I feel physically sick at the thought of going and picking up the results. Any thoughts you have on the chances of HIV transmission through giving oral sex to a woman would be appreciated, there is alot of conflicting infomation out there and I have nobody here to talk to.
(病人在尼加拉瓜的迪厅里一位女性发生了性关系，给与对方口交和有套性 交。)
医生回答
Relax. Most likely you weren't infected. To my knowledge, there are no documented cases of acquiring HIV by performing cunnlingus on an infected woman. If it occurs, undoubtedly it is rare. If this is your only risky behavior recently, you can expect your test result to be negative. (In fact, if you were my patient and the test came back positive, I would look you in the eye and say "OK, let's talk about your real risks, because you didn't catch it during that oral sex event.")
请你放松，你非常可能没有被感染。从我的经验来讲，HIV病史上没有任何记载病例是由给与(已感染)女性口 交行为。假如真的发生了，不可置疑那是极为少见的，假如这只是你唯一的高危经历，你可以等待一个阴的报告。(你要真的是我的病人，而且检测为阳的报告，我会看着你的眼睛，说，ok,我们来谈谈你真正的高危吧，因为你并没有从给与口 交传染hiv)
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