I have been told that you it is very rare to tranfer anal warts to someone. However, if you have HPV that causes anal warts, won't this transfer and infect someone?
No, it is not rare to transfer anal warts to someone. The same HPV viruses that show up in the cervix show up in the anus. It is just as likely to transmit to someone no matter if it's located in the anus or vagina.