I tried to find the same-sex data from ACS and collect them at the census tract level. There are some good information in the website (see below) but it doesn't specify which tables have such information.
After some research, I did find the "unmarried partner household" information from table B11009. According to census analysis, same-sex couples include "same-sex spouses" and "unmarried partners". Could someone help me identify the table(s) which includes the same-sex spouse information?