Kanojo no Dokushinsha-tachi ni Yotte Hadaka ni Sareta Seifuku no Shojo Kenkyuu

Both are short anime from the ´80s. Both are a bit weird/surreal and both have perverted moments. Both are made by Tanaami Keiichi and both have similar animation. 

Both are short, really old and little weird anime. 

"The Bride Stripped Bare by Her Bachelors" and "Colorful" are works with the focus on the topic of sex, in which they both incorporate uniquely styled hand-drawn animation alongside photographs of real-life.