In a 2003 study by the American Society for Microbiology, it was observed that 83% of women washed their hands after using the restroom, but only 74% of men did the same. It seems this is not unique to the US, as demonstrated in a British study conducted in highway service station restrooms, using electronic sensors to measure compliance. It was found that 65% of women and 35% of men washed their hands.
Men it seems need more encouragement than women to engage in proper hand washing behavior. Though most men and women do wash their hands using soap, 35% of men use just water (no soap) compared to 15% for women.
Read the full story about how the hand washing habits of men and women compare.