Joe and Nicky are captured by some sadists who want one of them to rape the other for their entertainment, not realizing that they're already together. Of course, it's not the physical act that's the issue, but the jeering crowd. They go along with it because risking their secret being found out while they're still captive would be much worse, but it's still a really upsetting experience for them both.

(And then they get loose and kill all their captors like the BAMFs they are. And maybe there's some sweet comfort sex at the end, IDK)