I'm his lover, not his concubine. If this is the course our sex life takes, I want no part. Lorena's attempts to keep the sex imaginative and adventurous are remarkable. Certainly, a woman with your creative powers can branch beyond the culinary realm to try something new. We think Lorena might be sublimating her guilt about fattening foods while Cliff feels like Lorena's own personal stairmaster.
Cliff needs to drop the stair and become the master, for now.
Your mutual problem centers around power, control and dominance. The two of you need to work through this underlying dynamic. At some point, the balance of power in your relationship tumbled. Let one partner take charge one night and the other the next. Lorena, learn to let yourself surrender to Cliff.