There are a number of reasons as to why female suicide bombers are used by groups. Terrorists use bombers as they are cheaper than purchasing arms. They are considered a low risk weapon and require low technology. They do not require much training, do not leave much of a trace behind, have the element of surprise, have easier access to targeted populations as well as soft targets, and tend to frighten the general population. As female combatants are seen as less likely to engage in lethal actions and can thus avoid suspicion, they are regarded as ideal combatants. Dress and gender stereotypes are often utilized by women to bypass security defenses. For example, women who appear pregnant appropriate related expectations and stereotypes to their benefit, discouraging invasive body searchers. Women may also "westernize" their appearance in an attempt at covering their actions and avoiding detection. Women are also deployed as suicide bombers as they tend to "elicit greater public sympathy and publicity for an organization." By some research, female bombers receive eight times more press coverage than their male counterparts.