You're all assuming this is a stepping-on-cake fetish. I'm not saying you're wrong... but maybe he's just a joker, and this is his way to weed out people with no sense of humour.
Maybe he's a foodie, and wouldn't even consider dating someone who would abuse cake in such a manor, even for love.
Maybe he really hates cake and wants to find someone who shares his passion for destroying cake in the funnest way possible.
Now I want to see what it feels like to step barefoot on cake...
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker