Years ago, I interviewed Tillamook Cheddar, a dog who creates art. I was reminded of Tillie when I saw the work of Alexander Esguerra. In these pieces, a couple covered in paint lies down on a blank canvas and has sex. The subjects are straight and gay, Caucasian and Chinese-American, married and adulterous — all of which makes you wonder what kind of picture a certain type of couple creates while making love. The one on the left looks like an orgy. The one on the right looks like they were going at it standing up. If you want to get an eyeful in person, Esguerra’s “It’s Just Sex” show opens May 22 at 676 Broadway in Manhattan.