My cat (male cat) always lies on the hot heater. What happened? Is there a problem?

My cat has the same problem. I took it to the doctor. After the doctor checked, he said that it was because the cat was not cleaned and the heat had a disinfection effect, so the cat squatted on it. Another problem is that it doesn't exercise much and is lazy. You should take more exercise. You should see a vet according to the situation.

Feather handwriting