The Bachelor, Ben Flajnik
We'd assume Ben and Courtney Robertson (the villain whom he ended up picking in the end) did sleep together in the fantasy suite. Especially since they'd already been pretty intimate when they secretly went skinny dipping in the ocean. Courtney revealed all that and more in her recent tell-all book:
"To answer your question, yes. Ben and I did have sex in the ocean. On-camera. It was immediate but it was only for about twenty seconds and, um, it was just the tip."