So much sarcasim flying around. the following article gives you a little sample of how prevailent this is. This is just a quote from the article.
"In 2000, the United Nations estimated that around 5,000 girls and women in at least 14 countries, among them Pakistan, Jordan and Turkey, were killed yearly because their families felt they brought dishonor on them."
http://www.dw-world.de/dw/article/0,,1244406,00.html
Seeing since Turkey is 99% Muslim, Pakistan is 97% Muslim, Jordan is 92% muslim I would tend to think that maybe this is mostly an Islamic thing.