I'm a feminist, I'm a submissive, and I'm (primarily) a lesbian, and I was thinking about this, and how a lot of people would see a submissive feminist as an oxymoron, but I often think about it in terms of feminism.
Feminism is about freedom, the freedom to be who you really are, and I think as a feminist I should have the right to submit to a partner of my choice without it reflecting on the nature of my entire sex. I also think that although I'm very feminine my femininity and my submissiveness (to a partner, in day to day life I'm independent and often very in command. I suppose I like to think of myself as the first mate of my relationship, they steer and I help them along) in any case, I don't think that femininity and submission are inherently linked, I think there can be dominant femininity and submissive femininity, and dominant masculinity and submissive masculinity and they are qualities that function entirely separately from one another