Welcome to the forum. I'll try to help.
There are no hard and fast rules about informing partners about HPV infection, which is why you have found conflicing information. Whether people with anal warts can transmit HPV to sex partners, when the partner does not come into direct contact with the anal area, is not known. Probably the same HPV infection may also be present on the penis or elsewhere in some people, but the frequency is not known, nor is the transmission risk from such exposure.
Some experts suggest that all persons with known or suspected HPV should inform all potential sex partners -- which the nurse you saw apparently believes. However, others point out that genital (or in some persons, anal) HPV infection is unavoidable and everybody is going to get one or more infections anyway, so that no special precautions are needed; people are equally likely to catch HPV whether or not partners tell them of their infections or not.
There is a lot uncertainty about oral HPV. Overt oral warts indeed are rare, although they are somewhat more common in people with advanced HIV infection (i.e., overt AIDS). Asymptomatic oral HPV may be more common, but it's still rare compared to anal and genital infection, and in general oral sex is not considered high risk for HPV transmission.
Below are links to other threads that provide additional perspective about informing partners and about oral HPV, including its relationship to oral cancers. In addition, I just tried entering "HPV informing partners" into this forum's search function and it came up with 371 threads. Many of those also may be helpful.
http://www.medhelp.org/posts/show/552283
http://www.medhelp.org/posts/show/588157
http://www.medhelp.org/posts/show/1181303
Finally, you don't say anthing about current treatment of your anal warts. Are they being treated?
In summary, my advice is that until your anal warts have been successfully treated or have cleared up on their own, you inform partners about them if there will be contact with your anus. Otherwise, consider it optional -- but if in doubt, it's generally better to tell than not. Also, any anal sex you have of course ought to be with condoms, and you should be asking all your partners about HIV status and discussing your own, before proceding with any sex.
Good luck-- HHH, MD