There is some debate whether certain types of sexual sensations should be accurately classified as orgasms, including female orgasms caused by G-Spot stimulation alone, and the demonstration of extended or continuous orgasms lasting several minutes or even an hour.[13] The question centers around the clinical definition of orgasm, but this way of viewing orgasm is merely physiological, while there are also psychological, endocrinological, and neurological definitions of orgasm.[11][12][14] In these and similar cases, the sensations experienced are subjective and do not necessarily involve the involuntary contractions characteristic of orgasm