This is not a bit. Dead serious. There is a luxurious hotel suite for a long weekend with whatever food, treats, toys and equipment you both request.
They are you from another reality where some mundane event is slightly different on the other side of the solar system yet to reach us. They are not a clone or time traveller. Everyone goes back to their own reality at the end. They are you with all of the benefits no complications or ethical questions.
And just in case no they cannot be gender swapped. (Curious why you might ask this? Hmm)
Do you have sex?
You can do other stuff of course if so comment. I love my ace comrades.
Nope. We’d spend the whole weekend doing any tasks that I’ve wanted to get done but couldn’t because I can only do one thing at a time. We make copies of the work we do so the other version can take those copies home.
Either that or spend the entire weekend collecting data on whatever rift let them show up and/or setting up equipment to collect data on the event when they get taken back.
I like sex, but how could I think about something so common when there is only a brief window for extremely rare and useful science to be done?