>>5243162If you don't, you should. It is the humane thing to do in that situation. By punish, I mean tease or cut off sex, or whatever. Nothing corporal. And I say this as a former fattie who didn't lose weight til my spouse said "Ugh, I am sorry, I love you, but your body no longer turns me on."
If her body (or his body, because this goes both ways) has gotten fat, tell her and get her to lose the weight. Obesity kills. Not just people. It kills boners. It kills libido. It kills performance. Et cetera and on and on, ad infinitum.