Squirtains
When a guy who just loves to rub against silk curtains ejaculates so much onto them that they become hard and crusty with dried semen. Ideally they will steadily grow in size until there is at least an inch thick layer of semen caked onto the curtains. At this point they are ready for harvesting. Cut the layer into one inch by one inch squares and sell them to your friends.
"Dried semen squares, directly from my living room squirtains. The melt-in-your mouth feeling that we all know and love!"