I have noticed recently that a vast swathe of TV ads use mixed-race families, which helps normalise them in the eyes of the average TV viewer. There are also a good number of gay and lesbian couples in ads these days. It becomes hard to remember when that wasn’t so. Here is a great ad by Guinness from 1995.
1995 is not a long time ago, but Guinness were forced to cancel the ad just before its showing due to the number of complaints and the vicious media backlash they received.