Naughty Teen (1977)

Young Daniela (Ursula Heinle) travels to the city to stay with her widowed uncle, who wrestles with temptation as his pretty house-guest flaunts her sexuality by showering with the door open and casually walking around nude. Meanwhile, much to her uncle's dismay, Daniela finds herself drawn to the womanizing pilot in a nearby apartment who previously lusted after her late aunt