the bed. Straighten his feet forward.

The woman sits on top of the man.

Facing the man, with both feet on the bed.

Then do the mating exercise.

(A 3D stereoscopic holographic image is presented above the lecture table: Bei Fei Fu)

The twelfth method is called back flying mallard.

It is the method of intercourse in which the woman falls on the man like a bird.

The specific approach is:

Ask the man to lie on his back on the bed. Straighten his feet forward.

The woman's back is facing the man. Sitting on the man's body.

His feet were entrenched on the bed. He lowered his head and hugged the man's feet.

Then do the mating exercise.

(A 3D stereoscopic hologram is presented above the lecture table: Yan Gaisong)

The thirteenth way is called Yangaisong.

It's like copulating like a downed pine tree.

The specific approach is: