Bathed in the shimmering summer light, the six episodes in “Frisky Summer 4” are all happy, playful and joyful expressions of youthful sexuality. With no specific story, “Frisky Summer 4” follows in the carefree mood and unobtrusive style of its best-selling predecessors which none of Bel Ami's imitators have succeeded in replicating. Where Bel Ami is concerned, “Frisky Summer” lasts all year long.