Read the following information. I think this is what you are looking for. Good luck.
http://www.cic.gc.ca/english/immigrate/sponsor/spouse-apply-who.asp
Common-law partner
You are a common-law partner—either of the opposite sex or same sex—if:
•you have been living together in a conjugal relationship for at least one year in a continuous 12-month period that was not interrupted. (You are allowed short absences for business travel or family reasons, however.)
You will need proof that you and your common-law partner have combined your affairs and set up a household together. This can be in the form of:
•joint bank accounts or credit cards
•joint ownership of a home
•joint residential leases
•joint rental receipts
•joint utilities (electricity, gas, telephone)
•joint management of household expenses
•proof of joint purchases, especially for household items or
•mail addressed to either person or both people at the same address.
Conjugal partner
This category is for partners—either of the opposite sex or same sex—in exceptional circumstances beyond their control that prevent them from qualifying as common-law partners or spouses by living together.
A conjugal relationship is more than a physical relationship. It means you depend on each other, there is some permanence to the relationship and there is the same level of commitment as a marriage or a common-law relationship.
You may apply as a conjugal partner if:
•you have maintained a conjugal relationship with your sponsor for at least one year and you have been prevented from living together or marrying because of: ◦an immigration barrier
◦your marital status (for example, you are married to someone else and living in a country where divorce is not possible) or
◦your sexual orientation (for example, you are in a same-sex relationship and same-sex marriage is not permitted where you live)
•you can provide evidence there was a reason you could not live together (for example, you were refused long-term stays in each other’s country).
You should not apply as a conjugal partner if:
•You could have lived together but chose not to. This shows that you did not have the level of commitment required for a conjugal relationship. (For example, one of you may not have wanted to give up a job or a course of study, or your relationship was not yet at the point where you were ready to live together.)
•You cannot provide evidence there was a reason that kept you from living together.
•You are engaged to be married. In this case, you should either apply as a spouse once the marriage has taken place or apply as a common-law partner if you have lived together continuously for at least 12 months.
