1. Porcelain cake toppers:

etsy.com
Don't worry, the artist can paint faces on them so they don't look like creepy ghost lesbians.
2. Zombie cake toppers:

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Because you'll be together even after death.
7. More pets!

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Yay! Pets!
Apparently what distinguishes the genders is an absence or presence of a little black top hat.
Also, they're the only ones I could find where one of the women was wearing a suit.
15. Dragon cake toppers:

etsy.com
Dragons probably don't have gender. Right?