"they don't want to" can be expanded into a number of causal cultural factors:

- teachers, parents, advisors all too often say tech is not for women - daughters are rarely given personal computers at the same as sons - video games, an important gateway into programming, are primarily marketed at boys - we have very few living role models of expert women programmers

Many of these same arguments apply to men and nursing. The primary reason we don't talk much about it in terms of access to opportunity is that comparatively, nursing is yet another underpaid pink collar job. If nursing was a comparable opportunity to tech, there'd probably be more grousing about the cultural barriers of masculinity that inhibit fuller participation.