canadianwoman said:
The more rejections an applicant has, the more suspicious the visa officer will be that any future sponsorship is just another attempt to get into Canada, this time by a marriage of convenience.
One failed TRV application when the applicant was trying to visit his or her spouse will be noted, but is probably OK and probably won't negatively affect the PR application. The more there are, the worse it looks. You have two - that should be OK, but the visa officer will definitely take it into account.
The way you deal with this potential red flag is to submit more evidence that your relationship is genuine (if you are being sponsored by a spouse or partner) than someone from your country would normally have to send. To repeat, two is probably OK, but the visa officer may have questions.
I think that rejections will only make an officer suspicious if they come before the two people become spouses. It is normal for spouses to try and visit their significant other in Canada.
For example, after our wedding my wife applied for a Study Permit which was denied. Three months later we submitted the PR application. I highly doubt the fact that my wife tried to come to Canada after marrying a Canadian will have any impact on our application whatsoever. We explained that we wanted to develop a longer period of cohabitation besides my visits, have my wife experience Canadian lifestyle, be able to spend time with my family, and improve her already well developed English language skills to make herself more employable in Canada before applying for PR. On top of that my parents wrote a letter of financial support and offered to cover her international student tuition charges, books, winter apparel and showed a bank statement. We included that in our PR application as we think it's excellent proof of my family accepting my wife into our family and proof our marriage is genuine.
In fact we are currently putting together a TRV application to try our luck with that. I visited in March and we vacationed in Bali, but I only have two weeks vacation left and I don't want to use it until the interview is waived. If there is an interview I want to have the time off to accompany my wife to the interview if it would take place this year. Therefore the only way we can be together in the next coming months is for her to visit me. I think even if it is denied that if anything it will show that we are trying to be in the same place.
However, had she applied before we met/gotten married, then I could see it being taken into account.