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Genital responses are not the only changes, but noticeable and necessary for consensual and comfortable intercourse.

Male arousal will lead to an erection, and in female arousal the body's response is engorged sexual tissues such as nipples, vulva, clitoris, vaginal walls and vaginal lubrication.

Scientists from Mc Gill University Health Centre in Montreal (in Canada) used the method of thermal imaging to record baseline temperature change in genital area to define the time necessary for sexual arousal.

Researchers studied the time required for an individual to reach the peak of sexual arousal while watching sexually explicit movies or pictures and came to the conclusion that on average women and men took almost the same time for sexual arousal — around 10 minutes.

Auditory stimuli are also possible, though they are generally considered secondary in role to the other three.

Erotic stimuli which can result in sexual arousal can include conversation, reading, films or images, or a smell or setting, any of which can generate erotic thoughts and memories in a person.

The lack of sexual arousal may be due to a general lack of sexual desire or due to a lack of sexual desire for the current partner.

A person may always have had no or low sexual desire or the lack of desire may have been acquired during the person's life.

This may in turn make the person desire direct sexual stimulation of the breasts, nipples, buttocks and/or genitals, and further sexual activity.Given sufficient sexual stimulation, sexual arousal in humans reaches its climax during an orgasm.It may also be pursued for its own sake, even in the absence of an orgasm.A person can take an active part in a sexual activity without sexual arousal.These situations are considered normal, but depend on the maturity, age, culture and other factors influencing the person.