It is funny...my vet and I were just talking about male calico/torties. They are relatively rare..roughly a half of a percent of them. They are sterile but the most interesting thing is they are often hermaphrodites. They have both male and female sexual organs. You just can't see the female ones and the organs might never mature enough to cause them to go into season. My vet just neutered a male calico last week and she has the owners watching out for signs of going into heat just in case.
Denyce