Schoolgirl Hitchhikers (1973)

Two young women undress each other. Breasts are visible. They crawl in to bed together in nightgowns and make love. This scene goes on for several minutes. Both women are completely naked. One of the women puts her head between the other woman's legs and begins performing oral sex. After a minute the woman orgasms. After a minute one of the women stands to close the bedroom door full frontal nudity is shown.