The stopperage is a sex position described in Sir Richard Francis Burton's translation of The Perfumed Garden. He says:
"Place the woman on her back, with a cushion under her buttocks, then get between her legs, resting the points of your feet against the ground; bend her two thighs against her chest as far as you can; place your hands under her arms so as to enfold her or cramp her shoulders. Then introduce your member, and at the moment of ejaculation draw her towards you. This position is painful for the woman, for her thighs being bent upwards and her buttocks raised by the cushion, the walls of her vagina tighten, and the uterus tending forward there is not much room for movement, and scarcely space enough for the intruder; consequently the latter enters with difficulty and strikes against the uterus. This position should therefore not be adopted, unless the man's member is short or soft."