It's right all calico cats are female but you can find red female cats, too. They are rare and it seems to me that you find them a bit oftener in southern European countries like Spain, Greece or Italy than here in Germany but well, red cats can be male and female.

Mitzi is an interesting name for a male cat; I this cat is male because ALL orange cats are male and all calico cats are male. Anyone finding a male calico cat can literally name their price for it.