LegalFling, a new app from a Dutch blockchain company, claims to be the first app to give users a "legally binding agreement" before getting it on.

The app also allows users to "match sexual preferences" before a fling to ensure the "do's and don't's are clear… to set the rules before play."

But this isn't a "Fifty Shades of Grey" type of contract. According to the makers, LegalFling creates a "legally binding agreement" that records sexual consent as well as privacy for videos and photos.

"Sex should be fun and safe, but nowadays a lot of things can go wrong," the site reads. "While you're protected by law, litigating any offenses through court is nearly impossible in reality. LegalFling creates a legally binding agreement, which means any offense is a breach of contract."

The app uses blockchain technology to create private, time-stamped records that are linked and secured using cryptography.