CNN recently reported on the following scenario:

Karen meets Jeff at a party and he instantly seems like a kindred spirit.

She keeps waiting to hear a telltale reference to an absent wife, girlfriend or partner but there's no mention of a significant other.

Jeff looks at her and acknowledges something special is happening; by the end of the night he's climbing the stairs to the fifth-floor walkup Karen shares with roommates.

Once inside Karen's room, Jeff grabs his phone and taps a few times.

Karen's phone beeps with an incoming text. She's received a WhatsApp message: "Jeff is requesting sexual consent." There's a heart-shaped icon for yes and an X for no.

Karen can tap the heart and appreciate the fact that Jeff cares about consent. Or she can tap the X and wonder what kind of guy has a sex app on his phone.

This hypothetical situation isn't some future shock "Black Mirror" fiction. A Dutch blockchain company is developing an app called LegalFling that creates sex contracts between consenting adults.

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