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Orgasms can be achieved by a variety of activities, including vaginal, anal or oral sex, non-penetrative sex or masturbation.
Orgasm may also be achieved by the use of a sex toy, such as a sensual vibrator or an erotic electrostimulation.
It can additionally be achieved by stimulation of the nipples or other erogenous zones, though this is rarer.
or an involuntary orgasm, such as in the case of rape or other sexual assault.
Orgasm (from Greek ὀργασμός orgasmos "excitement, swelling"; also sexual climax) is the sudden discharge of accumulated sexual excitement during the sexual response cycle, resulting in rhythmic muscular contractions in the pelvic region characterized by sexual pleasure.
They reported that, unlike females, "for the man the resolution phase includes a superimposed refractory period" and added that "many males below the age of 30, but relatively few thereafter, have the ability to ejaculate frequently and are subject to only very short refractory periods during the resolution phase".
It is believed that the amount by which oxytocin is increased may affect the length of each refractory period.
A scientific study to successfully document natural, fully ejaculatory, multiple orgasms in an adult man was conducted at Rutgers University in 1995.
Masters and Johnson equated male orgasm and ejaculation and maintained the necessity for a refractory period between orgasms.
In contrast to the two-stage model of male orgasm, Kahn (1939) equalized orgasm and ejaculation and stated that several orgasms can occur and that "indeed, some men are capable of following [an orgasm] up with a third and a fourth" orgasm.