In the first season of the show, it is mentioned one of the main female character had a sexual relationship with her French teacher when she was a teenager. S2E7: one if the main characters starts to have sex with their younger coworker while they are asleep and making him an unconsenting part of a 'threesome'. S3E4: one of the main characters watches as the other main character has sex with her husband without the partners knowing or consent. The character that acts as this voyeur brings it up later by saying something like 'you need to close your curtains'.