No sex scenes or nudity but mature sexual themes and dialogue are present throughout.
Infidelity is a main theme and is explored heavily.
It is implied that the individuals have previously been unfaithful in their marriages. This is confirmed for at least one character later in the film.
A character advises another character to avoid settling down and to instead pursue promiscuous relationships
A character offers to be a "wing man" for another character to help them "get laid"
A couple kisses after meeting at a bar
There are several scenes of flirting, typically between a married individual and a single person.