How do you define your masculinity/femininity?

In lieu of the recent Gillette ad, and seeing as the conversation around it has stirred the pot quite a bit, I wanted to propose a conversation where we start from the very beginning:

Without yet talking about subsets, variants, or interpretations of masculinity/femininity (toxic or otherwise). How do you define it for yourself: what makes you masculine or feminine, or what parts of you would you describe as such, do you feel that those things go as universal descriptors or are they specific to your case?

There may also be some deeper questions in here about where you think you gained this conception (your family? your immediate circle of contacts? Role models?) or who you think best embodies your ideal definition of your gender.