Final answer:
The hormone other than FSH that is secreted by the pituitary gland to regulate sex hormones is LH (luteinizing hormone), instrumental in both male and female reproductive processes.
Step-by-step explanation:
One of the two hormones secreted by the pituitary that regulates levels of sex hormones is FSH (follicle-stimulating hormone). The other hormone is LH (luteinizing hormone). Together, FSH and LH are critical for the reproductive processes in both males and females. Specifically, LH stimulates the production of testosterone in males and aids in the production of estrogens and progesterone in females, which are necessary for the menstrual cycle and fertility.