Fantasizing
Surveys suggest that men fantasize about sexual encounters about twice as often as women do. But it can be one of the most effective ways for women to tune in to a sexual experience because it helps turn off the parts of [their] brain associated with stress and anxiety. In fact, fantasizing is powerful enough to trigger orgasms in some women. In a study Beverly Whipple, PhD, co-author of The Science of Orgasm along with her colleagues Gena Ogden, PhD, and Barry R. Komisaruk, PhD, monitored the blood pressure, heart rate, pupil diameters, and pain tolerance of 10 women who claimed they could think their way to climax. As the subjects fantasized in a lab, seven exhibited the exact physical responses caused by hands-on stimulation. Encouraging your partner to fantasize may be difficult unless you know these secret strategies.
Forefinger, Fleshlight, Flirt and more in The Big Book of Sex.