Yes. A 'sixpack' is - in actuality - a pack of six cans (usually of something to drink, connected at the top by a flexible piece of plastic). But it is used as a metaphor to refer to a well-defined set of rectus abdominis muscles (not everyone has a sixpack). I imagine a female figure could have a sixpack, but in the culture I'm used to it's quite rare (at least it's quite rare for a very fit woman to make a lot of this part of her anatomy).
Etymological tangent: modern English is far from being the first to use a real-world image as the basis for a word that refers to a muscle. The word 'muscle' itself started life as a metaphor: musculus is, in Latin, a little mouse (which you can imagine crawling under a rug and giving the appearance of something moving under the surface.)
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