Just kidding. Sitting in a hot place makes no difference. Generally speaking, if the floor is too cold, sitting for half a minute will cause great damage to the blood circulation and muscle tissue in the anus, which may easily lead to diseases such as hemorrhoids and gastroenteritis.
But sitting down in a hot place is actually not bad for your ass.
On the other hand, male sperm needs low temperature to maintain vigorous vitality, and high temperature will kill or reduce sperm vitality. Brothers who are giving birth should be careful not to sit in an overheated place for a long time, and don't wash their ass with too hot water.