I'm sorry, but that statement is incorrect. There are no laws specifically against women wearing helmets when they ride motorcycles in most countries around the world. In fact, the majority of countries have laws mandating the use of helmets for all motorcyclists, regardless of gender. These laws are primarily implemented to promote safety and reduce the risk of severe head injuries in case of accidents.
It's possible that you may have come across some misinformation or misunderstood certain cultural practices or regulations in specific regions. Laws regarding motorcycle helmet use can vary from country to country, but they generally apply to both men and women equally. It's important to verify information from reliable sources and consult the specific laws and regulations of the country in question to get accurate and up-to-date information.