Apart from BMI, what is the female equivalent?

Perhaps age might also be a factor? Female fertility peaks in a woman's 20's.

(And yes, I realize we're all being a little shallow and tongue-and-cheek here)

Depends on what the goal is.

If it's just dating or a one night stand I think men can sometimes have potentially no standards at all.

If it's about marriage then there's things like hip to waist ratio, facial symmetry but I think in general men are much less picky.

The female equivalent is to reply the multiple DMs sent by desperate men.

bust waist hips

e.g. 32-26-32, etc.