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Understanding the science of her orgasm, from the first smile to the last happy shudder. Whether you are a woman with a need for improving your sexual experiences, or a man bothered as to why your partner cant reach orgasms as often you do during sexual intercourse, you need to understand the process of a womans orgasm. An orgasm is a physical reflex that occurs when muscles tighten during sexual arousal and then relax through a series of rhythmic contractions, sherry ross, md, a california-based ob-gyn. Understanding the stages that lead to an orgasm may help you masters and johnson wrote a book that detailed the sexual response cycle , which states that there are four stages of the sexual response. Female orgasm starts from arousal and swelling up of clitoris followed by vaginal lubrication and leads on to lengthening and stiffening of vagina and finally resolution. Discover the growing collection of high quality most relevant xxx movies and clips. No other sex tube is more popular and features more orgasm on stage scenes than pornhub! Browse through our impressive selection of porn videos in hd quality on any device you own. the case of the female orgasm bias in the science of evolution by elisabeth lloyd, ph. researchers have identified four stages of sexual response that is, the stages your body and mind goes through before, during, and after sex.