“You can also help your partner stretch her anus just like an athlete would stretch a muscle by using PNF stretching (proprioceptive neuromuscular facilitation). This type of stretching was designed to relax muscle and increase tone or activity. This is the reason I love this hack for helping with anal play: it helps your partner develop the distinction between a clenched and relaxed anus, while increasing flexibility. With your finger inserted in her anus, ask your partner to squeeze your finger, and press your finger up towards her G-spot.” – Excerpt from Beyond Satisfied by Kenneth Play, Chapter 14: Anal, Start Small, Stretch it Out