Different mattress types process heat in different ways. Memory foam has thick, dense layers, and so it is common for heat to become trapped by the mattress’ materials. Hybrids and latex beds, on the other hand, have more breathability and therefore remain cool, even as things heat up during sex. That is not to say that all memory foam mattresses sleep hot and all latex mattresses sleep cool; there are many factors that contribute to these qualities. For more on this, take a look at our top picks for best cooling mattresses.