People disagree about whether circumcision is a good for health and sexual pleasure. People who think circumcision is a good idea may point to health reasons. Circumcision reduces sexually transmitted diseases like HIV and HPV, prevents certain kinds of cancer, and gets rid of infections and unpleasant smells under the foreskin. If circumcision is done soon after birth, it makes it less common for baby boys to get urinary tract infections (UTIs). UTIs can cause permanent damage to the kidneys. Many people think a penis looks better if it is circumcised. A study done in the United States found that the women prefer a circumcised penis, to look at and in sexual activity, especially if they are going to put their mouth on the penis. In countries where most boys are circumcised as babies, parents sometimes think that uncircumcised boys will be teased. Some boys are mean to a boy if his penis looks different. Bullying was a bigger problem in the past when boys had to take showers together at school after gym class or before swimming. People opposed to routine circumcision are called "intactivists".