cannot speak to intercourse per se since, well, that was not one of my interests...however, I know that my partner was able to take quite the interest in me about as soon as I gave her that opportunity- and it WAS more fun than dilation. That being said, my guess is that traditional intercourse is going to put more strain on the stitches and that is why Brassard (and presumably others) give the guidance that they offer...
A better gauge for the individual is looking at your typical healing times on other injuries or surgeries...some take longer and others are up and about in next to no time. I was one of those that they practically had to chain down in the residence in Montreal because I was wanting to be out and about as soon as I was released from the recovery room.