Do men with asperger's have a significantly lower chance, or rate, of getting married?

Not necessarily... Asperger's is considered a mild form of autism that mainly affects social interaction. This would certainly extend to close relationships such as those that would lead to marriage. Please understand however, due to wide variability in this disease, that even though the chance of sucessful, long term relationship is likey lower than average each case is unique.
Depends. Asperger's patients can be socially awkward, so having relationships can be problematic. But as people can also be very kind, caring, and compassionate. There is always a chance they will find the right person for a long term relationship.