In 1999, Whipple and Komisaruk proposed cervix stimulation as being able to cause a fourth type of female orgasm.Female orgasms by means other than clitoral or vaginal/G-spot stimulation are less prevalent in scientific literature and most scientists contend that no distinction should be made between "types" of female orgasm. This distinction began with Sigmund Freud, who postulated the concept of "vaginal orgasm" as separate from clitoral orgasm. In 1905, Freud stated that clitoral orgasms are purely an adolescent phenomenon and that upon reaching puberty, the proper response of mature women is a change-over to vaginal orgasms, meaning orgasms without any clitoral stimulation. While Freud provided no evidence for this basic assumption, the consequences of this theory were considerable. Many women felt inadequate when they could not achieve orgasm via vaginal intercourse alone, involving little or no clitoral stimulation, as Freuds theory made penile-vaginal intercourse the central component to womens sexual satisfaction.The first major national surveys of sexual behavior were the Kinsey Reports. Alfred Kinsey was the first researcher to harshly criticize Freuds ideas about female sexuality and orgasm when, through his interviews with thousands of women, Kinsey found that most of the women he surveyed could not have vaginal orgasms. He "criticized Freud and other theorists for projecting male constructs of sexuality onto women" and "viewed the clitoris as the main center of sexual response" and the vagina as "relatively unimportant" for sexual satisfaction, relaying that "few women inserted fingers or objects into their vaginas when they masturbated".
In the novel Lady Chatterleys Lover (1928), by D. H. Lawrence, we can find an explicit narrative of a sexual act between a couple: "As he began to move, in the sudden helpless orgasm there awoke in her strange thrills rippling inside her..."

Other animals
The mechanics of male orgasm are similar in most male mammals. Females of some mammal and some non-mammal species, such as alligators, have clitorises. There has been ongoing research about the sexuality of dolphins, one of many species which engage in sexual intercourse for reasons other than reproduction. The duration of orgasm varies considerably among different mammal species. See also
References
Further reading
Banker-Riskin, Anita; Grandinetti, Deborah (1997). Simultaneous Orgasm: And Other Joys of Sexual Intimacy. Hunter House. ISBN 0-89793-221-8, ISBN 978-0-89793-221-9. Gabriele Froböse, Rolf Froböse, Michael Gross (Translator): Lust and Love: Is it More than Chemistry? Publisher: Royal Society of Chemistry, ISBN 0-85404-867-7, (2006). Komisaruk, Barry R.; Beyer-Flores, Carlos; Whipple, Beverly (2006). The Science of Orgasm. Baltimore, MD: The Johns Hopkins University Press. ISBN 9780801888953. OCLC 614506284. PARTRIDGE, Eric (2001). Shakespeares bawdy: Classics Series Routledge classics. 2nd ed., Routledge. ISBN 0-415-25400-0, ISBN 978-0-415-25400-7. Plato (2001). The Banquet. (P.B. Shelley, Trans., J. Lauritsen, Ed., Foreword). Provincetown, MA: Pagan Press. WEBB, Timothy (1976). The violet in the crucible: Shelley and translation, 1976. Oxford: Clarendon Press. External links

Mens Health: Male Orgasm
Net Doctor: Female Orgasm
TED Talk by Mary Roach on 10 things you didnt know about orgasm