McDonald’s has been forced to apologise after they played an explicit song whose lyrics featured references to underage sex and rape in one of their restaurants.

The track in question Only 17 by Rucka Rucka Ali was played to customer’s at the chain’s Haverfordwest branch and contains lyrics such as "I f**ked up my life, her butthole was tight/ But not worth doin' time, cause now I'm getin' boned in mine".

Steve Davidson, a customer who was there at the time of the incident said: "The bottom line is that it's bordering on pornography. It certainly shouldn't be playing in a restaurant where they sell Happy Meals to children.

"The lyrics are disgusting, they are very explicit – not just a bit risque or a bit of swearing. It's not what you want while you're having your breakfast. You have to be over 18 to download it, for them to be playing it somewhere that attracts children is obviously a concern."

McDonald’s themselves claim that the incident occurred after an employee left their personal music player connected to the sound system which resulted in the inappropriate song being played.

A spokesperson said: "McDonald's is a family-friendly restaurant and we endeavour to provide a restaurant environment that is welcoming, comfortable and enjoyable for everybody.

"The vast majority of our restaurants, including Haverfordwest, have external music providers dedicated to creating playlists that have been thoroughly screened for appropriateness of language and content. We apologise to Mr Davidson for this isolated lapse in our rigorous standards."