Gina Ryder watches another woman having sex with her husband in 'Lady Chatterley Stories'

Devinn Lane's Sex on the Beach in 'Passions Peak'

Devinn Lane is having sex on the beach

Jo Newman in 'Femme Fatales'

Taimie Hannum in the 'Witches of Breastwick'

IMDB

Virtual Sex with Kira Kener

Kira - Doggie - Virtual Sex

Sandra McCoy in the 'Femme Fatales' TV Series

Both are from the same episode, titled 'Extracurricular Activities':

Caroline Ambrose gets fucked against the door