I had a friend in college who was dating someone I could never figure out. One day he asked for my help with something a little, as he put it, delicate. He explained that his girlfriend only really got off on play rape, and had in fact been hinting that she wanted more realism than he'd been able to muster. Knowing that I'd taught myself to pick locks for fun as a teenager, he wanted me to pick the lock on her door one night.
Now, the two of us had a history of sorts, so his making the request wasn't too odd. He explained that he wanted me to come with him after opening the door, and help keep her from seeing his face or hearing his voice so she couldn't be completely sure whatever we did wasn't real, rather than a fantasy role play. I was a little leery, since I didn't know her at all, but he assured my I could trust him: she wanted it, bad.
Several days later, we went by, late. She lived in a cheap, two-story fourplex; her apartment lights were out. The lock was flimsy and easy (you probably could pick it yourself based just on watching television crime scenes), though my friend asked me to be sure that the tools clicked a lot before I got the door open, in the hopes that she might hear. As soon as the door was open he ran in, knowing his way in the dark, I assume. By the time I bumbled through the dark main room to the little bedroom in the back, my eyes had adjusted to the dimness and I saw he had a knee in her back and his hands over her mouth and eyes.
She struggled; I went over his assurances to me while he jerked his head silently at a roll of wide grey industrial tape he must have dropped on the bed. I taped her eyes shut fast, then he slapped her hard. The noise was loud, and I was a little surprised. He quickly taped around and around her head, cutting off her gasps by taping her mouth, then again and again over her eyes. He dropped her head and she squirmed on the bed, breathing loudly through her nose, moans of one sort or another filtering through. Then he taped her wrists together behind her back, and pulling her arms together hard, taped her elbows. It didn't look comfortable.