I didn't watch a lot of this, but here's a 'Witnessed Mediation' panel on Masculine Identities at the Butch Voices Conference. Here's the description if Video one of 5, linked below:

Several panelists born biologically female who describe themselves in ways such as butch, female-to-male transsexual, and aggressive, share what their identities mean to them, the kinds of reactions they get from others, and how they feel about it all.