Both the male pattern and female pattern wired brains are capable of multi-tasking and both do it. The difference is that the male pattern wired brain has the two hemispheres less well connected together than the female pattern one; the two hemisphere operate more independantly. Research has shown that male pattern wiring is better at multi-tasking when the two tasks lie in opposite hemispheres. Female pattern wiring is better at multi-tasking when the two tasks lie in the same hemisphere because of the greater connectivity between the two hemispheres. Female pattern brains tend to do less well with split left and right brain tasks because of the greater "interference" between the two halves. Male pattern brains tend to struggle when two tasks lie in the same hemisphere because the tasks compete for attention.
Nota Bene: Throughout I have said "MALE PATTERN" and "FEMALE PATTERN", not "male" and "female". There is a continuum of brain wiring with a distribution that is somewhat aligned with gender but with a large overlap in the middle.