Looks like whoever owns the site signed up with an ad agency of some kind. The site owner just takes what the agency serves up.
I don't mind the site owner using this method, but someone should have a method of vetting the ads first. For instance, this is a quilting/craft site - most members are women. We buy cars, might need a lawyer, plumber, etc.
We don't need or want dating sites that verge on porn.
Those that develop apps for cell phones do this, too. They just take what the ad service dishes out. There's pretty much the same complaint. Only thing I can think of - sleazier ad services pay more to get questionable ads on devices.