You'll need to get into your kitchen for this position: Sit on either the kitchen island or a table with your legs dangling over the edge.
And, just as it is with penises, every set of balls is different.
Do It: Lie back while your partner lies on top of you, face to face.
Top physical therapists, massage therapists and athletes all use massage balls for their own self-care and most use lacrosse balls for massage.
If you want to strengthen your pelvic floor, targeted exercises will help you identify and tone your muscles.
Your doctor can tell you more about best practices for you and your body.