It's more of an issue for jilted lovers. He gets a picture of her doing all sorts of dirty things. They break up. He threatens to send a picture of her deep throating him to her new employer. Or threatens to show doggy style pics to her parents (who might not approve of the interracial element). Or threatens to reveal the pics from that party where there were four guys from the football team... you get the point. That kind of thing. It happens. Especially with the younger generation which have been inculcated with "sex positive" education encouraging them to try out any and all types of kink. And they seem to think they need to record everything on their phones, or they're took drunk to stop their partner from recording it, or too high, etc.

Of course common sense says don't do anything which you would be ashamed to tell others about, but bedroom activities push the limits on that kind of advice.