They vary from animal to animal. In rats for example, females exhibit lordosis, an arching of the back in response to male sniffing and pawing, and darting, running back and forth in front of a male during estrous. "Feminized hypothalamus" male rats will lordose and dart in front of other males.
Also, why are none of these studies done on women?
There have been. Primate studies have been looking into the mamillary bodies, bed nucleus of the stria terminals, seritonergic system of the limbic system, the effect of testosterone on the developing female brain, for example. However, I'm more familiar with the male research from the seminar.
Please explain to me how a chemical imbalance causes someone who is looking at another with certain physical characteristics to become sexually attracted to them? Are you saying this imbalance causes homosexual males to confuse their gender? If so, I ask again, why are they not repeating these EXACT SAME STUDIES on women? (Human women, not monkeys)
My contention is that any sexual behavior is in one's head - not the hypothalamus, but the cognitive, sensory, and memory portions. I don't believe there is a gene that emits some kind of cosmic rays that causes a sexual attraction to someone with certain physical characteristics. That defies logic.