I know it probably doesn't seem like it, but this is one of the oddest questions I've seen asked about the sims. And someone on another forum asked if there was a way to have "surprise woohoo" (they claimed they weren't talking about rape but I'm not so sure) so I've got a lot of weird to compare it to.
No, see, if you yell "SURPRISE!", then it isn't rape, it's just a surprise! Like a surprise party, really, only...um...not. (Of course I'm completely kidding about this and would never advocate surprise woohoo!)
And in regards to the OP's question, all I can say is