What is the relationship between fertility and sexualty in TCM

Condition analysis:
Fertility and healthy sexuality depend on a rich supply of blood and essence to the reproductive organs, on the one hand, and a sufficiently hot "fire" on the other. For the blood aspect, TCM uses kidney yin tonics: nourishing, moistening herbs that provide luxuriant tonification and can improve the uterine lining, maintain the quality of eggs and sperm, and enhance vaginal lubrication. The prime example of such a substance is wine-steamed Rhemannia root, Shu Di Huang. The very look of the sliced root speaks to its effects: black, glistening, heavy, and pliable, so unlike most other roots, which tend to be dry and woody – a true ambrosia.

Other essence-nourishing herbs include sour, red fruits such as cornelian cherry Shan Zhu Yu or schisandra berry Wu Wei Zi. The sourness tones the mucus membranes and encourages production of fluids. The red colour usually indicates the presence of plant chemicals which benefit and nourish the blood.

In order to boost the fire, we must enhance the Yang aspect of the kidneys, which will translate into increased sexual desire, better motility of sperm, and a healthy luteal phase of the menstrual cycle. Herbs such as Epimedium Yin Yang Huo (also known as horny goat weed), Morinda Ba Ji Tian, and Eucommia Du Zhong provide the spark.

Instructions:
Couch grass - Agropyron repens (Gramineae) used for kidney: A vigorous perennial harvested throughout the year, couch grass is found on every continent except Africa. Couch grass contains polysaccharides (including triticin), volatile oil (including agropyrene), mucilage and other nutrients. Used medicinally since about 25 AD, couch grass increases urine production and treats urinary tract infections such as cystitis and urethritis. Couch grass relieves and even partially dissolves kidney stones. Couch grass (considered an invasive weed in many areas) can treat an enlarged prostate. The fresh juice can treat liver problems such as jaundice. The root can be roasted and ground as a coffee substitute. Couch grass has diuretic, demulcent and antibacterial properties.