Ceremony The Ritual Of Love (1976 )

Cast from IMDB:

Sharon Thorpe … Adrian

Kristine Heller … Nikki (as Kathy Kirk)
Monique Cardin … Beth (as Debbie Hamilton)
Ken Scudder … Uncle Lloyd
Desiree West … Mae (as Desireé)
Jeff Lyle … Tim (as Andy Brown)
Paul Scharf … Ted (as Bill Crawford)
Vicky Lindsay … Diana (as Anita Crest)
Laura Bourbon … Paula
Joey Silvera … Rapist (as Joe Arnold)
Ray Wells … Rapist (as Radio Ray)
Turk Lyon … Adrian’s Friend
John Seeman … Preacher (as John Reynolds)
www.imdb.com/title/tt0134514/