This dissertation research comprises the largest study, to date, of the perspectives and experiences of women partners of transgender and transsexual men in the United States and Canada. Research narratives gathered from this population are an extraordinarily-illuminating site for sociological analyses of sex, gender, sexuality, bodies, families, emotion work and household labor. Using in-depth qualitative interviews conducted with a geographically-diverse sample of fifty women partners of trans men, I examine the following research questions: 1) (How) are sex, gender and sexual orientation identities formed in complex co-relations and negotiations between partners through everyday practices and identity work as reported by participants?; 2) (How) are body image and sexuality relational and social processes, affected by a trans partner's body dysphoria?; 3) (How) does reported work by participants (in performing post-surgical care and mediating family relationships, for example) create emotional, psychological and/or "time" strains for women?; 4) (How) are existing social support resources and networks reported by participants as adequately developed in terms of their abilities to both understand and respond to the needs of women partners of trans men? Utilizing sociological conceptual frameworks on household labor and emotion work developed by Hochschild (1979; 1983;1989) and Carrington (1999), as well as methodological approaches on identity and identity work such as symbolic interactionism, ethnomethodology and phenomenology, this work broadens and extends existing sociological research and theory on women, identity, relationships and work that has heretofore not included women partners of trans men as participants.