Although there is clear evidence that many women with low testosterone levels do not experience sexual dysfunction, there is also evidence that testosterone plays a role in regulating female sexual desire and response. For example, studies have correlated low testosterone levels in women with decreased orgasmic ability, sexual pleasure and reduced libido. There is also evidence that women’s response to sexual stimuli (. erotic videos, sexual contact) is increased and that women have sex more frequently, during the mid point of their menstrual cycle, at which time testosterone levels are highest and they are also most fertile. In addition, there is evidence that testosterone levels increase in response to sexual stimuli. For example, a study in which women masturbated to orgasm reported that the women’s testosterone levels increased after orgasm.