I think more men are successful at tech because more enter the field. At my university, which was actually 56% female (IIRC), my electrical engineering classes almost entirely consisted of males.
I think it's worth looking at why more men enter the field.
I think it's also worth looking at why the participation of women in computer science in particular, as opposed to other technical fields, decreased on a relative basis after initial increases.[1]
I think it's also worth looking at why the participation of women in computer science in particular, as opposed to other technical fields, decreased on a relative basis after initial increases.[1]
[1] http://www.nytimes.com/2008/11/16/business/16digi.html?_r=0