Male and female moogles are identical to human eyes... I'm sure moogles know the difference, but it's hard for one of us to spot.

For example, in the Mog House game in FFVII's Gold Saucer: Mog and Mag look just the same, except for the colour of their pompoms. In FFIX, many moogles of each gender are encountered, yet the differences are hard to spot.

My advice... just pick a moogle. Any moogle.
Could be this moogle, could be that moogle.
It's your moogle of choice.
Make it count.

Pretend it is a she-moogle, and you shall believe. No-one will be any the wiser.