How do you master it?
You lie flat with your partner on top as he penetrates you from behind.
Then you need to keep your legs closed and his are slightly splayed so they lie outside yours.
The trick to make this position exciting is if you squeeze your legs together – that keeps you tight and instantly makes him feel bigger.
To maintain the pleasure, try rhythmically clenching and then realising your pelvic floor muscles.
Sammi recommended practising this with some kegel balls, which provide arousal and a seriously effective pelvic floor toning session.
You could further the experience in this move by adding a position enhancer to change the angle of penetration.