Dudes, carrying a condom around in your wallet is retarded. First of all your wallet moves around essentially all day long. That causes friction which, in time, breaks down a condom.
Secondly, women don't find it attractive. If I were to believe for a second that any one of you who isn't Urban is making frequent trips to the butcher shop then maybe you would understand what I'm talking about. The least romantic thing you could possibly do before putting on a jimmy hat is pull that wrinkled old thing out of your wallet. If the woman wasn't to have sex with you, chances are she has purchased some prophylactics of her own in preparation. Women prepare. They know they are going to fuck you right when they meet you. You probably aren't going to do anything in the time you know them to get them to want to fuck you unless they accept money in exchange for sex. What I'm saying here is before the date she will have purchased the condoms and lube (if she is experienced enough to realize condoms don't work w/o lube) and it is already in her medicine cabinet. If you are hosting, then you should have some in yours... but chances are if you guys aren't already fucking, she isn't going to fuck you at your place for the first time anyhow.
Lastly carrying a condom around in your wallet is just skeevy. If you don't already know this then that says all you need to say.
It is alright to be prepared, but ridiculously lame to keep it in your wallet at all times.