Subtractive masculinity is when things are only defined as "male" or "manly" or "masculine", and the people doing them as successful men, if there are few or no, women and girls doing them. Subtractive ideas of masculinity can lead to active sexism towards women and girls trying to enter a field, because their presence becomes a threat to the masculinity of the male participants. The term may have been coined in a 2007 blog post by Doctor Science: