My wife has several vibrators that are shaped like cocks and every other conceivable sex object and she uses them occasionally to enhance the mood of a lover’s penetration. Penetration doggy style is a favorite position because it allows her to manipulate her clitoris with a min-vibrator if her lover’s balls aren’t large enough to smack her vulva during penetration. She claims that her orgasm using a vibrator is overwhelming and she uses it rarely because it causes her to swoon.