I feel the two issues are not really related. I don't worry about STD'S because I think that they are low risk and even a few doctors have told me that they can all be treated. Condom use is not natural in my opinion. I use Listirene on a regular basis. Tests at universities in Tokyo and Melbourne show it is effective at killing many common STD's. For someone with allergy a carpet is just no good and they trap cat fur and other allergens. I had a cat when I was married and my ex-Thai wife banned the cat from our bedroom because cat fur would go all over the bed. She also said she did not want a cat on the bed when we have sex. My first apartment is tiled but the two bedrooms have carpet.