Maybe the Million Moms would like it better if the survivalists wore a banana hammock and a bikini, lol!
Actually now that I think about it, why don't they just have a random pairing of teammates that could also be 2 males or 2 females? The nude male and female casting is designed for shock factor - to make us wonder if they will hook up. Even though, as you say Bearcata they are too busy trying to survive. Not to mention their breath stinks, they have BO and are all in all not looking their best!
Also, it seems like they should get a prize at the end of the 21 days. Are they getting paid to do the show? It is 3 weeks of their time after all.