わたしのＳＥＸ白書　絶頂度 (1976)

Akemi is a laboratory technician who spends her evenings spying on her gangster neighbor as he makes love to his stripper girlfriend. The objects of Akemi's voyeuristic attentions learn of her interests and suggest that she would make a fine prostitute. Surprisingly Akemi agrees and channels her interests into this more lucrative occupation.