[Jensson]

Most animals are in heat just a small part of the time, humans are in heat all the time. Animals in heat behave a lot more like humans do regarding these things. Humans still have the genes to populate the earth, we haven't adapted to having a stable population yet where we don't optimize for maximum kids.

[infp_arborist]

I would like to add that humans are in heat only when they are healthy and feel safe (emotionally, financially, physically). The traumatized modern western society tends to get in the way of this.

[jakear]

Humans are in heat approximately a quarter of the time max, far from "all".

Though a fair bit closer than dogs, who are in heat around a twenty fifth of the time.