Hi.
Not entirely sure what You mean, but generally yes, with almost all passive cabs and with active cabs that have daisy chainable inputs (/passive outputs) that can be done. The two connectors are just wired in parallel.
By Your wording I'd imagine that You have a powered mixer and passive cabs? You have been using speaker cables, right? Not microphone cables with adapters?
The XLR input of a passive cab is male for 2 reasons
AFAIK.
1: No way of accidentally shorting the speaker outputs if the cable is disconnected from the cab end.
2: As the cable have males on both ends, that can't be used in any other MI connection if the standards are being followed.
Any MI store should have XLR speaker cables. Better yet, You can make your own A LOT cheaper. Just remember to stick with Neutrik or similar for connectors and rubber for insulation as opposed to plastic. The rubber usually smells a lot worse, and costs more, but is more wear resistant and is more comfortable to handle.
Regards
Sam