Mine to Take by Dara Joy, featuring a naked, square-jawed, long-haired, five-o'clock-shadowed, body-waxed historical hunk chained to a dungeon ceiling. Our heroines' hand is entering the cover from left, brandishing an erect key.
"He was full-blooded and untamable. Sensual and sinuous. Erotically magnetic. A uniquely beautiful creature who could make himself irresistable to women. And he was feral at heart. With his glittering green and gold eyes [presumably not one of each], silken hair, and purring voice, the stunning captive chained to the wall was exactly what Jenise needed. And he was hers to take... Or so she believed. But she had never heard how dangerous it was to lie down with the cat."
ETA: They *are* one of each. It's a fantasy novel about werecats who are legendary for their sexual prrrrowess, including the ability to make women reach their "sexual peak" by "kiss alone". I hope he hasn't had that little trip to the vet.