Osteoporosis is associated with loss of

bone density

Explanation:

osteoporosis occurs when your body absorbs more bone than it produces. In other words, your bones lose density, become weak, and are prone to fractures. This process isn't the sole cause of osteoporosis; there are other factors that contribute to and exacerbate the onset of the disease.

to keep it profesional sex is the main way humans reproduce

explanation: