Technically a vagina has six holes (assuming this guy is talking about the whole genital when he says vagina):
The urethra, where pee comes out
The vagina, where sex
Two paraurethral glands (Skene’s glands), which secrete lubricating mucous during arousal and also produce female ejaculate when squirting (it’s not piss!) - these glands are analogous to prostatic glands in males
Two greater vestibular glands (Bartholin glands, which are paravaginal), which also secrete lubricating fluid.
Although I would advise against putting anything in those last four (they are visible to the naked eye but still very small). Also not sure how he counted 5.