02:40
In the Driver's Seat: Sexual Orientation
Although opinions differ as to what determines sexual orientation, most scientists believe that for males it is primarily inborn. Simon LeVay, for example found a cluster of nerve cells in the hypothalamus that is larger in heterosexual males than...
03:20
In the Driver's Seat: Sex Motivation
Although men and women are motivated to be sexually desirably, the biological urge for sex differs from motives such as thirst and hunger. Beginning in adolescence, sex motivates both men and women but in different ways in terms of their response pa...