For some women, the clitoris is very sensitive after climax, making additional stimulation initially painful.Masters and Johnson argued that all women are potentially multiply orgasmic, but that multiply orgasmic men are rare, and stated that "the female is capable of rapid return to orgasm immediately following an orgasmic experience, if re-stimulated before tensions have dropped below plateau phase response levels". Though generally reported that women do not experience a refractory period and thus can experience an additional orgasm, or multiple orgasms, soon after the first one, some sources state that both men and women experience a refractory period because women may also experience a period after orgasm in which further sexual stimulation does not produce excitement. After the initial orgasm, subsequent orgasms for women may be stronger or more pleasurable as the stimulation accumulates. Clitoral and vaginal categories
Discussions of female orgasm are complicated by orgasms in women typically being divided into two categories: clitoral orgasm and vaginal (or G-spot) orgasm. In 1973, Irving Singer theorized that there are three types of female orgasms; he categorized these as vulval, uterine, and blended, but because he was a philosopher, "these categories were generated from descriptions of orgasm in literature rather than laboratory studies". In 1982, Ladas, Whipple and Perry also proposed three categories: the tenting type (derived from clitoral stimulation), the A-frame type (derived from G-spot stimulation), and the blended type (derived from clitoral and G-spot stimulation).
Other factors and research
Regular difficulty reaching orgasm after ample sexual stimulation, known as anorgasmia, is significantly more common in women than in men (see below). In addition to sexual dysfunction being a cause for womens inability to reach orgasm, or the amount of time for sexual arousal needed to reach orgasm being variable and longer in women than in men, other factors include a lack of communication between sexual partners about what is needed for the woman to reach orgasm, feelings of sexual inadequacy in either partner, a focus on only penetration (vaginal or otherwise), and men generalizing womens trigger for orgasm based on their own sexual experiences with other women.Scholars state "many couples are locked into the idea that orgasms should be achieved only through intercourse [vaginal sex]" and that "[e]ven the word foreplay suggests that any other form of sexual stimulation is merely preparation for the main event.... ...Because women reach orgasm through intercourse less consistently than men, they are more likely than men to have faked an orgasm". Sex counselor Ian Kerner stated, "Its a myth that using the penis is the main way to pleasure a woman." He cites research concluding that women reach orgasm about 25% of the time with intercourse, compared with 81% of the time during oral sex (cunnilingus).In the first large-scale empirical study worldwide to link specific practices with orgasm, reported in the Journal of Sex Research in 2006, demographic and sexual history variables were comparatively weakly associated with orgasm.