You now have the option for same sex romances in Mass Effect 3 for the PC, PS3, and Xbox 360.
Here is the list of same sex romances you have the option for.
Check out my other guide for the complete list of romance options in Mass Effect 3.
Same sex romance options for male Shepard
Kaidan Alenko
Steven Cortez
Same sex romance options for female Shepard
Diana Allers
Liara T’Soni
Samantha Traynor