A key characteristic of orgasm is that stimulation must continue up until orgasm and then preferably cease. Consequently a woman can never orgasm through intercourse because this activity only continues up until male orgasm, which triggers the ejaculation of sperm and is vital to reproduction. The vagina is part of the birth canal and can always be penetrated. This fact is the clearest evidence we have that the vagina could never be a sex organ capable of producing an orgasmic response.