PSU 20/24-pin ATX power cables are male-ended (plugged into female socket at PSU and plugged into female socket at MB). This also goes for the 4/8-pin ATX12V/EPS power cable and the 6/8-pin PCIE power cable - - all are male-ended.
Only the SATA power cables and Peripheral (4-pin Molex) cables that come with your PSU are male-to-female (plugged into female socket at PSU and plugged into male socket of different PC components).