You may have heard the argument that some things aren't 'wrong' because Jesus didn't say they were wrong. But isn't that like telling your Math teacher that 2+2=5 isn't wrong because she didn't say it was wrong, when all along you know she told you what the right answer is? Don't fall for the argument that because Jesus didn't say a particular activity was sin that it is okay.
Jesus didn't say it was wrong - so...