The ornamental design for a mop base with slidably attachable female to male mop head, as shown and described.
FIG. 1 is a detailed illustration of a perspective top view of the mop base with slidably attachable female to male mop head.
FIG. 2 is a detailed illustration of a perspective top view of the mop base with slidably attachable mop head with the female to male mop head extended; and,
FIG. 3 is a detailed illustration of a side view of the mop base with slidably attachable female to male mop head.
Portions of the mop base with slidably attachable female to male mop head not shown in the drawings form no part of the claimed design.