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Most sexual reproduction in the animal world is facilitated through opposite-sex sexual activity, although there are also animals that reproduce asexually , including protozoa and lower invertebrates. Kinsey Reports Intimate heterosexual couple At the beginning of the 20th century, early theoretical discussions in the field of psychoanalysis posited original bisexuality in human psychological development. Quantitative studies by Alfred Kinsey in the s and Dr. Fritz Klein 's sexual orientation grid in the s find distributions similar to those postulated by their predecessors. According to Sexual Behavior in the Human Male by Alfred Kinsey and several other modern studies, the majority of humans have had both heterosexual and homosexual experiences or sensations and are bisexual. Kinsey himself, along with current sex therapists, focused on the historicity and fluidity of sexual orientation. Kinsey's studies consistently found sexual orientation to be something that evolves in many directions over a person's lifetime; rarely, but not necessarily, including forming attractions to a new sex.According to several studies, the answer is a resounding 'yes'. So, here's what lesbian sex can teach us about female pleasure. Dr. Freda Bush gives an example from her OB/Gyn practice about heterosexual anal sex. Heterosexuality is largely defined as attraction to the opposite sex, although the most rigid definitions of the word demand an attraction to the opposite gender as ...the end of the story look at the video above ↑ ↑ ↑
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