FX103 "FLEXのママ活相場ラジオ" is a program that discusses the market rates for "mamakatsu" relationships, focusing on how age affects these rates for both men and women. The program explores the value men in their early 20s and late 20s bring, as well as the economic power and support styles of women in their 30s, 40s, and 50s and older. It emphasizes that the "market rate" is determined by a complex balance of supply and demand, influenced by the age and perceived value of both parties involved.