Simplify the expression. 
Definitions:
LH Secretion
The release of Luteinizing Hormone from the anterior pituitary gland, crucial for reproductive processes.
Uterine Wall
The muscular layer of the uterus, which expands during pregnancy and contracts during childbirth.
Estrogen Production
The synthesis of estrogen hormones, primarily by the ovaries, which play key roles in female reproductive health and secondary sexual characteristics.
Sexual Act
A physical interaction between individuals that involves the genital organs, often for reproduction or pleasure.
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