The film is a 15 there are no "gratuitous sex scenes" in fact the sex in this film is some of the least "risqué" i've seen in a long time. You see more in "Emily in paris" or "Sex education" on netflix.
The film itself is a really good British story, acted very well by the actors and delivered in a good pacing. There where a few moments where as a viewer you would yell in your head! "call the police" but these moments i guess are to help drive along the plot.
There is a trigger warning i must offer that if you are affected by domestic violence there are scenes in this that are very well done and realistic and although kept in as good a taste as possible, i can certainly see how someone may be triggered by it.
Over all it was well written, well acted, well edited, FANSTASTIC score and music on all scenes. The Pacing lost itself but the ending was strong with an almost "post credits" type ending.
I am recommending to friends to watch to discuss as its been a while in a sea of blockbusters to find a little gem to talk around the table with a glass of wine!