When another girl is present who may, or may not, join the fun

[somerandomweird]

The series Cheating Husbands, by Cheaters Club XXX, illustrates this kind of idea in which there is a couple having sex, and there is a second female present who may simply watch or possibly join in the fun. Anyone know of other examples where there is an additional woman present (in any capacity - dominatrix, voyeur, mistress, female director, etc.) while a man and woman has sex?

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