What is he doing to that watermelon? (very rude and groos, warning not to read further)

When they said you should be more creative and maybe include other senses in your love-making, perhaps food -- that wasn't what they meant.
So, isn't that guy including food into his sex?
Uh ... no. He's replaced food as a partner. Equally gross would be Fat Bastard eating a buffet on the right and your lover/mate on the left. That's really not including food in your sex.
Then there's the 500 pound people who have replaced food for their sex.
Of course, we could have an overszed hammer slamming onto the watermelon, coating each person during sex with watermelon parts -- somewhat including food and sex, but in a hackneyed way.

Please, don't play with your food on your plate, though food play is okay. Also, don't ***k your food.