It’s from 1980 or 81. it’s about a girl named Tatiana who is a sexually active teen lives with her sister (ophelia I think) and parents. Her mother is a commercial actress and Tatiana also made her first movie. Hints: there’s a reference to the movie 10; Tatiana has long red hair, she has a interview with people magazine and ends up on the cover I believe her boyfriends name is Josh.
Lost Classics of Teen Lit: Name That Book! 
Norma Klein’s Domestic Arrangements…Lizzie Skurnick republished it several years ago.
When I 1st read it in the 80s it was marketed as midlist adult fiction.
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Thank You ninyabruja Now I have more room in my brain
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